APA

Gas Processors Association G., . (1987). Tentative method for the determination of ammonia in liquid propane. Tulsa, Oklahoma: Gas Processors Association, GPA.

Chicago

Gas Processors Association GPA, . 1987. Tentative method for the determination of ammonia in liquid propane. Tulsa, Oklahoma: Gas Processors Association, GPA.

Harvard

Gas Processors Association G., . (1987). Tentative method for the determination of ammonia in liquid propane. Tulsa, Oklahoma: Gas Processors Association, GPA.

MLA

Gas Processors Association GPA, . Tentative method for the determination of ammonia in liquid propane. Tulsa, Oklahoma: Gas Processors Association, GPA. 1987.