Citazione APA

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

Stile di citazione Chicago

Gorle, Peter, e James Long. Essentials of Product Planning. New York: McGraw Hill, 1973.

Citazione MLA

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