Gaya APA

Larsen-Freeman, D., Long, M, H. (1990). An introduction to second language acquisition research/ Diane Larsen-Freeman, Michael H. Long . London: Longman.

Gaya MLA

Larsen-Freeman, Diane., Long, Michael, H.. "An introduction to second language acquisition research/ Diane Larsen-Freeman, Michael H. Long". London: Longman, 1990. Text.