APA

American Petroleum Institute A., . (2009). Specification for fire test for valves with automatic backseats. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2009. Specification for fire test for valves with automatic backseats. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2009). Specification for fire test for valves with automatic backseats. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Specification for fire test for valves with automatic backseats. Washington: American Petroleum Institute, API. 2009.