APA-referens (7:e uppl.)

KAUFMANN, W. J. (1973). Relativity and cosmology. Harper and Row Pub.

Chicago-referens (17:e uppl.)

KAUFMANN, Williuam J. Relativity and Cosmology. New York: Harper and Row Pub, 1973.

MLA-referens (9:e uppl.)

KAUFMANN, Williuam J. Relativity and Cosmology. Harper and Row Pub, 1973.