APA

Gas Processors Association G., . (2003). Selection, preparation, validation, care and storage of natural gas and natural gas liquids reference standard blends. Tulsa, Oklahoma: Gas Processors Association, GPA.

Chicago

Gas Processors Association GPA, . 2003. Selection, preparation, validation, care and storage of natural gas and natural gas liquids reference standard blends. Tulsa, Oklahoma: Gas Processors Association, GPA.

Harvard

Gas Processors Association G., . (2003). Selection, preparation, validation, care and storage of natural gas and natural gas liquids reference standard blends. Tulsa, Oklahoma: Gas Processors Association, GPA.

MLA

Gas Processors Association GPA, . Selection, preparation, validation, care and storage of natural gas and natural gas liquids reference standard blends. Tulsa, Oklahoma: Gas Processors Association, GPA. 2003.