APA
American Petroleum Institute A., . (2020). Installation, maintenance, and repair of safety valves (SSV, USV, and BSDV). Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2020. Installation, maintenance, and repair of safety valves (SSV, USV, and BSDV). Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2020). Installation, maintenance, and repair of safety valves (SSV, USV, and BSDV). Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Installation, maintenance, and repair of safety valves (SSV, USV, and BSDV). Washington: American Petroleum Institute, API. 2020.