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.