एपीए उद्धरण

Williams, M. A. J. (1993). Quaternary environments. Arnold.

शिकागो स्टाइल उद्धरण

Williams, M A J. Quaternary Environments. London: Arnold, 1993.

एमएलए उद्धरण

Williams, M A J. Quaternary Environments. Arnold, 1993.