Παραπομπή σε μορφή APA (7η εκδ.)

Wilson, R. J. (2002). Four colours suffice: How the map problem was solved. Penguin Books.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Wilson, Robin J. Four Colours Suffice: How the Map Problem Was Solved. London: Penguin Books, 2002.

Παραπομπή σε μορφή MLA (8th εκδ.)

Wilson, Robin J. Four Colours Suffice: How the Map Problem Was Solved. Penguin Books, 2002.