APA aipamena

Kaufmann, W. J. (1999). Universe (5th ed.). New York: W.H. Freeman.

Chicago Style aipamena

Kaufmann, William J. Universe. 5th ed. New York: W.H. Freeman, 1999.

MLA aipamena

Kaufmann, William J. Universe. 5th ed. New York: W.H. Freeman, 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.