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. New York: McGraw Hill, 1973.

एमएलए उद्धरण

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