एपीए उद्धरण

Van Duyn J. (1975). practical system and procedures manual. Reston publishing co.

शिकागो स्टाइल उद्धरण

Van Duyn J. Practical System and Procedures Manual. Virginia: Reston publishing co, 1975.

एमएलए उद्धरण

Van Duyn J. Practical System and Procedures Manual. Reston publishing co, 1975.