APA (7th ed.) Citation

Harley, B. (1990). The Development of second language proficiency / edited by Birgit Harley ... (et al.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Harley, Birgit. The Development of Second Language Proficiency / Edited by Birgit Harley ... (et Al.). Cambridge: Cambridge University Press, 1990.

MLA (9th ed.) Citation

Harley, Birgit. The Development of Second Language Proficiency / Edited by Birgit Harley ... (et Al.). Cambridge University Press, 1990.

Warning: These citations may not always be 100% accurate.