एपीए उद्धरण

Whitehall, H. . .. Structural essentials of english. Longman.

शिकागो स्टाइल उद्धरण

Whitehall, Harold. Structural Essentials of English. London: Longman.

एमएलए उद्धरण

Whitehall, Harold. Structural Essentials of English. Longman.