APA

American Petroleum Institute A., . (1997). A national survey on naturally occurring radioactive material (NORM) in petroleum production and gas processing facilities. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1997. A national survey on naturally occurring radioactive material (NORM) in petroleum production and gas processing facilities. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1997). A national survey on naturally occurring radioactive material (NORM) in petroleum production and gas processing facilities. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . A national survey on naturally occurring radioactive material (NORM) in petroleum production and gas processing facilities. Washington: American Petroleum Institute, API. 1997.