APA
American Petroleum Institute A., . (2003). Manual of petroleum measurement standards. Chapter 12- Calculation of petroleum quantities. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2003. Manual of petroleum measurement standards. Chapter 12- Calculation of petroleum quantities. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2003). Manual of petroleum measurement standards. Chapter 12- Calculation of petroleum quantities. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Manual of petroleum measurement standards. Chapter 12- Calculation of petroleum quantities. Washington: American Petroleum Institute, API. 2003.