Cita APA (7a ed.)

Johnson, K., & Morrow, K. (1979). Approaches: A language activation course for intermediate students. Cambridge University.

Cita Chicago Style (17a ed.)

Johnson, Keith, y Keith Morrow. Approaches: A Language Activation Course for Intermediate Students. Cambridge: Cambridge University, 1979.

Cita MLA (9a ed.)

Johnson, Keith, y Keith Morrow. Approaches: A Language Activation Course for Intermediate Students. Cambridge University, 1979.