Gaya APA

BAKER, R, H. (1968). An Introduction to astronomy / by Robert Baker and Laurence W. Frederick (7 th ed). : D. Van Nastrand.

Gaya MLA

BAKER, Robert, H.. "An Introduction to astronomy / by Robert Baker and Laurence W. Frederick". 7 th ed : D. Van Nastrand, 1968. Hukum Tata Negara Islam.