Tube selection guide 1956-1957.
APA Citation
Kroes, T. J. (1956). Tube selection guide 1956-1957. [Eindhoven: Philips' Gloeilampenfabrieken.
MLA Citation
Kroes, Th. J. Tube Selection Guide 1956-1957. [Eindhoven: Philips' Gloeilampenfabrieken, 1956.
Warning: These citations may not always be complete (especially for serials).