APA način citiranja (7. izdanje)

Appel, K. I., & Haken, W. (1989). Every planar map is four colorable. American Mathematical Society.

Čikaški stil citiranja (17. izdanje)

Appel, Kenneth I., i Wolfgang Haken. Every Planar Map Is Four Colorable. Providence: American Mathematical Society, 1989.

MLA način citiranja (9. izdanje)

Appel, Kenneth I., i Wolfgang Haken. Every Planar Map Is Four Colorable. American Mathematical Society, 1989.