APA ציטוט

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

Trích dẫn kiểu Chicago

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

ציטוט MLA

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