APA
American Petroleum Institute A., . (1997). Proceedings of the 1995 API and GRI naturally occurring radioactive material (NORM) conference. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1997. Proceedings of the 1995 API and GRI naturally occurring radioactive material (NORM) conference. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1997). Proceedings of the 1995 API and GRI naturally occurring radioactive material (NORM) conference. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Proceedings of the 1995 API and GRI naturally occurring radioactive material (NORM) conference. Washington: American Petroleum Institute, API. 1997.