Παραπομπή APA

Budker. (1971). The life of sharks (4th ed.). Wiedenfeld & Nicolson.

Παραπομπή Chicago Style

Budker. The Life of Sharks. 4th ed. Wiedenfeld & Nicolson, 1971.

Παραπομπή MLA

Budker. The Life of Sharks. 4th ed. Wiedenfeld & Nicolson, 1971.