APA Citatie

Hester,Jeff, & Hester, J. J. (2007). 21st century astronomy (2nd ed.). New York: W.W. Norton.

Chicago Style citaat

Hester,Jeff, en John Jeffrey Hester. 21st Century Astronomy. 2nd ed. New York: W.W. Norton, 2007.

MLA citatie

Hester,Jeff, en John Jeffrey Hester. 21st Century Astronomy. 2nd ed. New York: W.W. Norton, 2007.