APA
American Petroleum Institute A., . (1977). Pilot studies on enhancement of the refinery activated sludge process. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1977. Pilot studies on enhancement of the refinery activated sludge process. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1977). Pilot studies on enhancement of the refinery activated sludge process. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Pilot studies on enhancement of the refinery activated sludge process. Washington: American Petroleum Institute, API. 1977.