एपीए उद्धरण

(2007). 21st century astronomy. New York: W.W. Norton.

शिकागो स्टाइल उद्धरण

21st Century Astronomy. New York: W.W. Norton, 2007.

एमएलए उद्धरण

21st Century Astronomy. New York: W.W. Norton, 2007.