Style de citation APA (7e éd.)

Ontario Institute for Studies in Education & Harley, B. (1990). The Development of second language proficiency. Cambridge University Press.

Style de citation Chicago (17e éd.)

Ontario Institute for Studies in Education et Birgit Harley. The Development of Second Language Proficiency. Cambridge ; New York: Cambridge University Press, 1990.

Style de citation MLA (8e éd.)

Ontario Institute for Studies in Education et Birgit Harley. The Development of Second Language Proficiency. Cambridge University Press, 1990.