APA

American Petroleum Institute A., . (1997). Methods for measuring naturally occurring radioactive materials (NORM) in petroleum production equipment. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1997. Methods for measuring naturally occurring radioactive materials (NORM) in petroleum production equipment. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1997). Methods for measuring naturally occurring radioactive materials (NORM) in petroleum production equipment. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Methods for measuring naturally occurring radioactive materials (NORM) in petroleum production equipment. Washington: American Petroleum Institute, API. 1997.