Cita APA

Harley, B. (1996). The development of second language proficiency (1st. ed.). Cambridge, U.K.: Cambridge University.

Citación estilo Chicago

Harley, Birgit. The Development of Second Language Proficiency. 1st. ed. Cambridge, U.K.: Cambridge University, 1996.

Cita MLA

Harley, Birgit. The Development of Second Language Proficiency. 1st. ed. Cambridge, U.K.: Cambridge University, 1996.