APA
American Petroleum Institute A., . (2011). Recommended practice for chemical analysis of barite. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2011. Recommended practice for chemical analysis of barite. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2011). Recommended practice for chemical analysis of barite. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Recommended practice for chemical analysis of barite. Washington: American Petroleum Institute, API. 2011.