APA

American Petroleum Institute A., . (2014). Seat tightness of pressure relief valves. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2014. Seat tightness of pressure relief valves. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2014). Seat tightness of pressure relief valves. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Seat tightness of pressure relief valves. Washington: American Petroleum Institute, API. 2014.