APA aipamena

(2004). Astronomy: Essential study partner (Version 2.0.). New York: McGraw-Hill.

Chicago Style aipamena

Astronomy: Essential Study Partner. Version 2.0. New York: McGraw-Hill, 2004.

MLA aipamena

Astronomy: Essential Study Partner. Version 2.0. New York: McGraw-Hill, 2004.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.