APA ציטוט

A Pannekoek. (1961). A history of astronomy. New York: Interscience.

Trích dẫn kiểu Chicago

A Pannekoek. A History of Astronomy. New York: Interscience, 1961.

ציטוט MLA

A Pannekoek. A History of Astronomy. New York: Interscience, 1961.