एपीए उद्धरण

Gorle Peter & James Long. (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.