APA (7th ed.) Citation

LARSEN-FREEMAN, D., & LONG, M. H. (1999). An introduction to second language acquisition research. Longman.

Chicago Style (17th ed.) Citation

LARSEN-FREEMAN, Diane, and Michael H. LONG. An Introduction to Second Language Acquisition Research. London: Longman, 1999.

MLA (9th ed.) Citation

LARSEN-FREEMAN, Diane, and Michael H. LONG. An Introduction to Second Language Acquisition Research. Longman, 1999.