APA (7th ed.) Citation

Probert, R. (1958). This money-saving guide tells how to size up electromagnetic relays. Product Engineering., 29, 66.

Chicago Style (17th ed.) Citation

Probert, R. "This Money-saving Guide Tells How to Size Up Electromagnetic Relays." Product Engineering. 29 (1958): 66.

MLA (9th ed.) Citation

Probert, R. "This Money-saving Guide Tells How to Size Up Electromagnetic Relays." Product Engineering., vol. 29, 1958, p. 66.