एपीए उद्धरण

Open University, Mathematics Foundation Course Team. (1971). Groups II. Open Uty press.

शिकागो स्टाइल उद्धरण

Open University, Mathematics Foundation Course Team. Groups II. Open Uty press, 1971.

एमएलए उद्धरण

Open University, Mathematics Foundation Course Team. Groups II. Open Uty press, 1971.