Cita APA (7th ed.)

Larsen-Freeman, D., & Long, M. H. (1991). An introduction to second language acquisition research. Longman.

Cita Chicago (17th ed.)

Larsen-Freeman, Diane, i Michael H. Long. An Introduction to Second Language Acquisition Research. London: Longman, 1991.

Cita MLA (9th ed.)

Larsen-Freeman, Diane, i Michael H. Long. An Introduction to Second Language Acquisition Research. Longman, 1991.