APA
American Petroleum Institute A., . (2001). Specification for the fabrication of structural steel pipe. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2001. Specification for the fabrication of structural steel pipe. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2001). Specification for the fabrication of structural steel pipe. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Specification for the fabrication of structural steel pipe. Washington: American Petroleum Institute, API. 2001.