APA

Baker A., Goldstein S., . (1989). Pronunciation pairs: student's book. Estados Unidos: Cambridge University Press.

Chicago

Baker Ann, Goldstein Sharon, . 1989. Pronunciation pairs: student's book. Estados Unidos: Cambridge University Press.

Harvard

Baker A., Goldstein S., . (1989). Pronunciation pairs: student's book. Estados Unidos: Cambridge University Press.

MLA

Baker Ann, Goldstein Sharon, . Pronunciation pairs: student's book. Estados Unidos: Cambridge University Press. 1989.