एपीए उद्धरण

William Kirwood Purves. (1995). Life, the science of biology. Salt Lake City, Utah: W. H. Freeman.

शिकागो स्टाइल उद्धरण

William Kirwood Purves. Life, the Science of Biology. Salt Lake City, Utah: W. H. Freeman, 1995.

एमएलए उद्धरण

William Kirwood Purves. Life, the Science of Biology. Salt Lake City, Utah: W. H. Freeman, 1995.