एपीए उद्धरण

Beilby,M.H. (1975). Economics and operational research. Pitman Publishing.

शिकागो स्टाइल उद्धरण

Beilby,M.H. Economics and Operational Research. London: Pitman Publishing, 1975.

एमएलए उद्धरण

Beilby,M.H. Economics and Operational Research. Pitman Publishing, 1975.