APA
American Petroleum Institute A., . (1999). Recommended practice for repair, testing, and setting gas lift valves. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1999. Recommended practice for repair, testing, and setting gas lift valves. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1999). Recommended practice for repair, testing, and setting gas lift valves. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Recommended practice for repair, testing, and setting gas lift valves. Washington: American Petroleum Institute, API. 1999.