APA aipamena

Krogdahl, W. S. (1952). The astronomical universe. New York: The Macmillan Company.

Chicago Style aipamena

Krogdahl, Wasley S. The Astronomical Universe. New York: The Macmillan Company, 1952.

MLA aipamena

Krogdahl, Wasley S. The Astronomical Universe. New York: The Macmillan Company, 1952.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.