APA (7th ed.) Citation

Schum, J. L. (1988). Electronic locking devices. Butterworths.

Chicago Style (17th ed.) Citation

Schum, John L. Electronic Locking Devices. Boston ; London: Butterworths, 1988.

MLA (9th ed.) Citation

Schum, John L. Electronic Locking Devices. Butterworths, 1988.

Warning: These citations may not always be 100% accurate.