Hartsfield, N., & Ringel, G. (1990). Pearls in graph theory: A comprehensive introduction. Academic Press.
Lua i Stíl Chicago (17ú heag.)Hartsfield, Nora, agus Gerhard Ringel. Pearls in Graph Theory: A Comprehensive Introduction. Boston: Academic Press, 1990.
Lua MLA (9ú heag.)Hartsfield, Nora, agus Gerhard Ringel. Pearls in Graph Theory: A Comprehensive Introduction. Academic Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.