Không rõ. (2001). Product Planning and Development. Youth PublishingHouse.
シカゴスタイル引用形Không rõ. Product Planning and Development. Youth PublishingHouse, 2001.
MLA引用形式Không rõ. Product Planning and Development. Youth PublishingHouse, 2001.
警告: この引用は必ずしも正確ではありません.