Cita APA (7a ed.)

Morris, S., & Stanton, A. (1993). The Nelson Proficiency Course. Nelson.

Cita Chicago Style (17a ed.)

Morris, Susan, y Alan Stanton. The Nelson Proficiency Course. Walton-on-Thames: Nelson, 1993.

Cita MLA (9a ed.)

Morris, Susan, y Alan Stanton. The Nelson Proficiency Course. Nelson, 1993.