एपीए उद्धरण

books, T. l. (1971). Natural Science annual. U.S.A.

शिकागो स्टाइल उद्धरण

books, Time life. Natural Science Annual. New York: U.S.A, 1971.

एमएलए उद्धरण

books, Time life. Natural Science Annual. U.S.A, 1971.