APA (7. basım) Alıntı

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

Chicago Style (17. basım) Atıf

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

MLA (8th ed.) Atıf

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