APA
American Petroleum Institute A., . (1970). Curves for selecting beam pumping units. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1970. Curves for selecting beam pumping units. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1970). Curves for selecting beam pumping units. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Curves for selecting beam pumping units. Washington: American Petroleum Institute, API. 1970.