APA

American Petroleum Institute A., . (2001). Manual of petroleum measurement standards. Chapter 12- Calculation of petroleum quantities. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2001. Manual of petroleum measurement standards. Chapter 12- Calculation of petroleum quantities. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2001). 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. 2001.