APA (7th ed.) Citation
Zappe, R. W. (1981). Valve selection handbook. Gulf.
Chicago Style (17th ed.) Citation
Zappe, R. W. Valve Selection Handbook. Houston: Gulf, 1981.
MLA (9th ed.) Citation
Zappe, R. W. Valve Selection Handbook. Gulf, 1981.
Warning: These citations may not always be 100% accurate.