एपीए उद्धरण

R B Gupta. (1992). Text book of machine drawing. new Delhi.

शिकागो स्टाइल उद्धरण

R B Gupta. Text Book of Machine Drawing. new Delhi, 1992.

एमएलए उद्धरण

R B Gupta. Text Book of Machine Drawing. new Delhi, 1992.