APA (7th ed.) Citation

Erk, M. H. v., & Onstee, H. G. (1974). Digital instrument cource. Philips.

Chicago Style (17th ed.) Citation

Erk, M. H van, and H. G. Onstee. Digital Instrument Cource. Eindhoven: Philips, 1974.

MLA (9th ed.) Citation

Erk, M. H van, and H. G. Onstee. Digital Instrument Cource. Philips, 1974.