एपीए उद्धरण

Lewis, R. F. (1961). Planning and control for profit. Heinemann.

शिकागो स्टाइल उद्धरण

Lewis, Ralph F. Planning and Control for Profit. London: Heinemann, 1961.

एमएलए उद्धरण

Lewis, Ralph F. Planning and Control for Profit. Heinemann, 1961.