Gorle, P., & Long, J. (1973). Essentials of product planning. McGraw-Hill.
シカゴスタイル引用形Gorle, Peter, , James Long. Essentials of Product Planning. London: McGraw-Hill, 1973.
MLA引用形式Gorle, Peter, , James Long. Essentials of Product Planning. McGraw-Hill, 1973.
警告: この引用は必ずしも正確ではありません.