APA

American Petroleum Institute A., American Petroleum Institute A., . (1997). 1996 API/NPRA survey of refining operations and product quality. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, American Petroleum Institute API, . 1997. 1996 API/NPRA survey of refining operations and product quality. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., American Petroleum Institute A., . (1997). 1996 API/NPRA survey of refining operations and product quality. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, American Petroleum Institute API, . 1996 API/NPRA survey of refining operations and product quality. Washington: American Petroleum Institute, API. 1997.