Cita APA (7a ed.)

Phillips, W. D., & Phillips, C. R. (1992). The worlds of Christopher Columbus. University Press.

Cita Chicago Style (17a ed.)

Phillips, William D., y Carla Rahn Phillips. The Worlds of Christopher Columbus. Cambridge [etc.]: University Press, 1992.

Cita MLA (9a ed.)

Phillips, William D., y Carla Rahn Phillips. The Worlds of Christopher Columbus. University Press, 1992.