Gaya APA

Zeilik, M., Pasachoff, J, M. (1991). Astronomy: From The Earth To The Universe (Ed. 4). New York: Saunders College Publishing.

Gaya MLA

Zeilik, Michael., Pasachoff, Jay, M. "Astronomy: From The Earth To The Universe". Ed. 4 New York: Saunders College Publishing, 1991. Text.