Παραπομπή APA

Robinson, D. F., & Foulds, L. R. (1980). Digraphs: Theory and techniques. Gordon and Breach.

Παραπομπή Chicago Style

Robinson, D. F., και L. R. Foulds. Digraphs: Theory and Techniques. New York: Gordon and Breach, 1980.

Παραπομπή MLA

Robinson, D. F., και L. R. Foulds. Digraphs: Theory and Techniques. Gordon and Breach, 1980.