APA
American Petroleum Institute A., . (2009). Positive displacement pumps rotary. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2009. Positive displacement pumps rotary. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2009). Positive displacement pumps rotary. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Positive displacement pumps rotary. Washington: American Petroleum Institute, API. 2009.