एपीए उद्धरण

Engelbert, P. (1997). Astronomy and Space: From the Big Bang to the Big Crunch. U. X. L.

शिकागो स्टाइल उद्धरण

Engelbert, Phillis. Astronomy and Space: From the Big Bang to the Big Crunch. New York: U. X. L, 1997.

एमएलए उद्धरण

Engelbert, Phillis. Astronomy and Space: From the Big Bang to the Big Crunch. U. X. L, 1997.