(1976). A guide to philips. Netherlands: N.V. Philips' Gloeilampenfabrieken.
Trích dẫn kiểu ChicagoA Guide to Philips. Netherlands: N.V. Philips' Gloeilampenfabrieken, 1976.
Deismireacht MLAA Guide to Philips. Netherlands: N.V. Philips' Gloeilampenfabrieken, 1976.
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