APA
American Petroleum Institute A., . (2007). Special-Purpose couplings for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2007. Special-Purpose couplings for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2007). Special-Purpose couplings for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Special-Purpose couplings for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API. 2007.