APA ציטוט

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

Trích dẫn kiểu Chicago

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

ציטוט MLA

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