Παραπομπή APA

Posamentier, A. S., & Lehmann, I. (2006). Pi: A biography of the world's most mysterious number. Universities Press.

Παραπομπή Chicago Style

Posamentier, Alfred S., και Ingmar Lehmann. Pi: A Biography of the World's Most Mysterious Number. Hyderabad: Universities Press, 2006.

Παραπομπή MLA

Posamentier, Alfred S., και Ingmar Lehmann. Pi: A Biography of the World's Most Mysterious Number. Universities Press, 2006.