Cita APA (7th ed.)

Chartrand, G., & Lesniak Foster, L. (1986). Graphs and digraphs (2a. ed.). Wadsworth and Brooks-Cole Advanced Books and Software.

Cita Chicago (17th ed.)

Chartrand, Gary, i Linda Lesniak Foster. Graphs and Digraphs. 2a. ed. Monterey: Wadsworth and Brooks-Cole Advanced Books and Software, 1986.

Cita MLA (9th ed.)

Chartrand, Gary, i Linda Lesniak Foster. Graphs and Digraphs. 2a. ed. Wadsworth and Brooks-Cole Advanced Books and Software, 1986.