APA
American Petroleum Institute A., . (1989). Compact steel gate valves extended body. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1989. Compact steel gate valves extended body. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1989). Compact steel gate valves extended body. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Compact steel gate valves extended body. Washington: American Petroleum Institute, API. 1989.