Cita APA

Harley, B., Allen, P., & Swain, M. K. (1990). The development of second language proficiency. Cambridge: Cambridge University Press.

Citación estilo Chicago

Harley, Birgit, Patrick Allen, y Merrill Kathleen‏ Swain. The Development of Second Language Proficiency. Cambridge: Cambridge University Press, 1990.

Cita MLA

Harley, Birgit, Patrick Allen, y Merrill Kathleen‏ Swain. The Development of Second Language Proficiency. Cambridge: Cambridge University Press, 1990.