APA

Dulay H. C., Burt M. K. & Krashen S. D. (1982). Language two. New York: Oxford University Press.

Chicago

Dulay Heidi C, Burt Marina K and Krashen Stephen D. 1982. Language two. New York: Oxford University Press.

Harvard

Dulay H. C., Burt M. K. and Krashen S. D. (1982). Language two. New York: Oxford University Press.

MLA

Dulay Heidi C, Burt Marina K and Krashen Stephen D. Language two. New York: Oxford University Press. 1982.