Cita APA

Collie, J., Slater, S., & Doff, A. (1993). Speaking 4. Cambridge: Cambridge University Press.

Citación estilo Chicago

Collie, Joanne, Stephen Slater, and Adrian Doff. Speaking 4. Cambridge: Cambridge University Press, 1993.

Cita MLA

Collie, Joanne, Stephen Slater, and Adrian Doff. Speaking 4. Cambridge: Cambridge University Press, 1993.