Citazione Stile APA (7a Edizione)

Hartsfield, N., & Ringel, G. (1990). Pearls in graph theory: A comprehensive introduction. Academic Press.

Citazione stile Chigago Style (17a edizione)

Hartsfield, Nora, e Gerhard Ringel. Pearls in Graph Theory: A Comprehensive Introduction. Boston: Academic Press, 1990.

Citatione MLA (9a ed.)

Hartsfield, Nora, e Gerhard Ringel. Pearls in Graph Theory: A Comprehensive Introduction. Academic Press, 1990.