Kaufmann, W. J. (1999). Universe (5th ed.). New York: W.H. Freeman.
Trích dẫn kiểu ChicagoKaufmann, William J. Universe. 5th ed. New York: W.H. Freeman, 1999.
MLA引文Kaufmann, William J. Universe. 5th ed. New York: W.H. Freeman, 1999.
警告:這些引文格式不一定是100%准確.