APA
American Petroleum Institute A., . (1968). Measuring, sampling, and testing natural gas fluids. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1968. Measuring, sampling, and testing natural gas fluids. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1968). Measuring, sampling, and testing natural gas fluids. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Measuring, sampling, and testing natural gas fluids. Washington: American Petroleum Institute, API. 1968.