एपीए उद्धरण

Gorle, P., & Long, J. (1973). Essentials of product planning. McGraw-Hill.

शिकागो स्टाइल उद्धरण

Gorle, Peter, और James Long. Essentials of Product Planning. London: McGraw-Hill, 1973.

एमएलए उद्धरण

Gorle, Peter, और James Long. Essentials of Product Planning. McGraw-Hill, 1973.