एपीए उद्धरण

(2010). 21st century astronomy. New York: W. W. Norton.

शिकागो स्टाइल उद्धरण

21st Century Astronomy. New York: W. W. Norton, 2010.

एमएलए उद्धरण

21st Century Astronomy. New York: W. W. Norton, 2010.