Παραπομπή APA

Zeilik, M. (1979). Astronomy: The evoloving Universe. Harper & Row.

Παραπομπή Chicago Style

Zeilik, Michael. Astronomy: The Evoloving Universe. New York: Harper & Row, 1979.

Παραπομπή MLA

Zeilik, Michael. Astronomy: The Evoloving Universe. Harper & Row, 1979.