Hester Jeff, Burstein David, Blumenthal George, Smith Bradford, Greeley Ronald, & Voss HowardmG. (2007). 21st Century Astronomy. American: W. W. Norton.
Chicago Style citaatHester Jeff, Burstein David, Blumenthal George, Smith Bradford, Greeley Ronald, en Voss HowardmG. 21st Century Astronomy. American: W. W. Norton, 2007.
MLA citatieHester Jeff, et al. 21st Century Astronomy. American: W. W. Norton, 2007.
Let op: Deze citaties zijn niet altijd 100% accuraat.