Cita APA (7a ed.)

Esat R. ,Morison, A., Morrison, A., & Norton, J. (1990). Get sharp. Heinmann.

Cita Chicago Style (17a ed.)

Esat R. ,Morison, A., A. Morrison, y J. Norton. Get Sharp. Nairobi: Heinmann, 1990.

Cita MLA (9a ed.)

Esat R. ,Morison, A., et al. Get Sharp. Heinmann, 1990.