Cita APA (7a ed.)

Anderson, J., & Humphreys, G. (1973). The discovery of America. Puffin Books.

Cita Chicago Style (17a ed.)

Anderson, J.R.L, y Graham Humphreys. The Discovery of America. Harmondsworth: Puffin Books, 1973.

Cita MLA (9a ed.)

Anderson, J.R.L, y Graham Humphreys. The Discovery of America. Puffin Books, 1973.