APA (7th ed.) Citation

National Association of Relay Manufacturers. (1969). Engineers' relay handbook (Rev. 2d ed.). Hayden Book Co..

Chicago Style (17th ed.) Citation

National Association of Relay Manufacturers. Engineers' Relay Handbook. Rev. 2d ed. New York: Hayden Book Co., 1969.

MLA (9th ed.) Citation

National Association of Relay Manufacturers. Engineers' Relay Handbook. Rev. 2d ed. Hayden Book Co., 1969.