APA

American Petroleum Institute A., . (1949). Flanged steel gate and plug valves for drilling and production service. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1949. Flanged steel gate and plug valves for drilling and production service. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1949). Flanged steel gate and plug valves for drilling and production service. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Flanged steel gate and plug valves for drilling and production service. Washington: American Petroleum Institute, API. 1949.