APA
Gas Processors Association G., . (1998). Obtaining natural gas samples for analysis by gas chromatography. Tulsa, Oklahoma: Gas Processors Association, GPA.
Chicago
Gas Processors Association GPA, . 1998. Obtaining natural gas samples for analysis by gas chromatography. Tulsa, Oklahoma: Gas Processors Association, GPA.
Harvard
Gas Processors Association G., . (1998). Obtaining natural gas samples for analysis by gas chromatography. Tulsa, Oklahoma: Gas Processors Association, GPA.
MLA
Gas Processors Association GPA, . Obtaining natural gas samples for analysis by gas chromatography. Tulsa, Oklahoma: Gas Processors Association, GPA. 1998.