Cita APA (7a ed.)

Adams, P., & Helleiner, F., M. (1972). International Geography 1972: Volumes 1 and 2. University of Toronto Press.

Cita Chicago Style (17a ed.)

Adams, Peter, y Frederick Helleiner, M. International Geography 1972: Volumes 1 and 2. Toronto: University of Toronto Press, 1972.

Cita MLA (8a ed.)

Adams, Peter, y Frederick Helleiner, M. International Geography 1972: Volumes 1 and 2. University of Toronto Press, 1972.