Philips. (1981). PTI in brief. Nertherlands: Philips' Telecommunicatie Industrie BV.
シカゴスタイル引用形Philips. PTI in Brief. Nertherlands: Philips' Telecommunicatie Industrie BV, 1981.
MLA引用形式Philips. PTI in Brief. Nertherlands: Philips' Telecommunicatie Industrie BV, 1981.
警告: この引用は必ずしも正確ではありません.