Cita APA

Richards, J., & Long, M. (1988). Breakthrough: A Course in English Communication Practice. London: Oxford University Press.

Citación estilo Chicago

Richards, J.C., y M.n Long. Breakthrough: A Course in English Communication Practice. London: Oxford University Press, 1988.

Cita MLA

Richards, J.C., y M.n Long. Breakthrough: A Course in English Communication Practice. London: Oxford University Press, 1988.