Chapter 25 Further Reading: Language Learning

Foundational Research

Krashen, S. D. (1982). Principles and Practice in Second Language Acquisition. Pergamon Press. The original statement of Krashen's Input Hypothesis — perhaps the most influential (and contested) theory in second language acquisition research. Whether or not you accept every element of the hypothesis, the central claim — that language acquisition requires comprehensible input — is foundational. Freely available online.

Swain, M. (1985). "Communicative competence: Some roles of comprehensible input and comprehensible output in its development." In S. Gass & C. Madden (Eds.), Input in Second Language Acquisition. Newbury House. The original statement of the Output Hypothesis — the argument that producing language (speaking, writing) drives acquisition in ways that comprehending input alone does not. Provides the theoretical foundation for the speaking practice recommendations.

Nation, I. S. P. (2001). Learning Vocabulary in Another Language. Cambridge University Press. The most comprehensive academic treatment of second language vocabulary acquisition. The vocabulary frequency research, the coverage statistics (how many words you need to know to understand what percentage of text), and the evidence for spaced repetition in vocabulary learning all have foundations in this work.

Book-Length Treatments for Learners

Kató Lomb (1970/2008). Polyglot: How I Learn Languages. TEFL.net (translation by Scott Alkire). A memoir of language learning by a Hungarian translator who learned 16 languages to high proficiency as an adult. Practical, wise, and directly relevant to adult learners. Lomb predated modern SLA research but describes approaches remarkably consistent with what the research later validated. Freely available online.

Benny Lewis (2014). Fluent in 3 Months. HarperOne. A language blogger's account of learning languages rapidly through aggressive conversation-first approaches. The "3 months" claims require context, but Lewis's practical advice on overcoming speaking anxiety and maximizing output is valuable. Treat the timeline claims skeptically; treat the speaking-first advice seriously.

Wyner, G. (2014). Fluent Forever: How to Learn Any Language Fast and Never Forget It. Harmony Books. A former opera singer's method for language acquisition combining pronunciation-first learning, spaced repetition with self-made multimedia cards, and comprehensible input. The pronunciation-first framework is distinctive and worth engaging with. The Anki card-making methodology is particularly detailed and useful.

On Spaced Repetition for Languages

Nakata, T. (2011). "Computer-assisted second language vocabulary learning in a paired-associate paradigm: A critical investigation of flashcard software." Computer Assisted Language Learning, 24(1), 17–38. A research evaluation of SRS-based vocabulary learning specifically in L2 contexts. Validates the effectiveness of SRS for vocabulary acquisition while noting the importance of card design and production practice.

Schmitt, N. (2008). "Instructed second language vocabulary learning." Language Teaching Research, 12(3), 329–363. A review article summarizing what the research says about vocabulary instruction in second language contexts. Covers spaced repetition, deliberate study, and incidental acquisition through reading. Provides the research backdrop for the vocabulary section of this chapter.

Research on Adult Language Learning

Birdsong, D. (2005). "Interpreting age effects in second language acquisition." In J. Kroll & A. de Groot (Eds.), Handbook of Bilingualism. Oxford University Press. A nuanced treatment of what the research actually says about age effects in language acquisition. Challenges the strong critical period hypothesis while acknowledging real differences between child and adult acquisition. Good corrective against both the "adults can't learn languages" myth and the "age doesn't matter at all" overcorrection.

DeKeyser, R. M. (2000). "The robustness of critical period effects in second language acquisition." Studies in Second Language Acquisition, 22(4), 499–533. Research on the critical period hypothesis showing that morphosyntactic acquisition (grammar) is affected by age differently than phonological acquisition (pronunciation). Adults can acquire grammar to native-like levels; native-like pronunciation is genuinely harder after the critical period.

Practical Resources

Foreign Service Institute (fsi.gov/Language-Learning/Foreign-Language-Training): The FSI's language difficulty ratings and hour estimates, cited in this chapter, are publicly available on their website. These are the most rigorous real-world estimates of language learning timelines available and should be the baseline for realistic planning.

JLPT level descriptions (jlpt.jp): The Japanese Language Proficiency Test level descriptions provide useful benchmarks for Japanese learners. Similar standardized assessments exist for most major languages (DELF for French, DELE for Spanish, etc.) and provide useful proficiency targets.

Antimoon.com: A website by two Polish polyglots describing their methodology for learning English (and the principles for any language acquisition). Detailed, evidence-grounded, and highly practical. The "How to Learn English" section applies to any target language.