APA
American Petroleum Institute A., . (1997). Specification for marine drilling riser couplings. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1997. Specification for marine drilling riser couplings. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1997). Specification for marine drilling riser couplings. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Specification for marine drilling riser couplings. Washington: American Petroleum Institute, API. 1997.