APA aipamena

Jeff Hester. (2007). 21st century astronomy: Stars and Galaxies. New York: Norton.

Chicago Style aipamena

Jeff Hester. 21st Century Astronomy: Stars and Galaxies. New York: Norton, 2007.

MLA aipamena

Jeff Hester. 21st Century Astronomy: Stars and Galaxies. New York: Norton, 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.