Citazione Stile APA (7a Edizione)

Wilson, R. (2002). Graphs, colourings, and the four-colour theorem. Oxford University Press.

Citazione stile Chigago Style (17a edizione)

Wilson, Robert. Graphs, Colourings, and the Four-colour Theorem. Oxford, New York: Oxford University Press, 2002.

Citatione MLA (9a ed.)

Wilson, Robert. Graphs, Colourings, and the Four-colour Theorem. Oxford University Press, 2002.