APA

American Petroleum Institute A., . (2011). Type testing of process valve packing for fugitive emissions. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2011. Type testing of process valve packing for fugitive emissions. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2011). Type testing of process valve packing for fugitive emissions. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Type testing of process valve packing for fugitive emissions. Washington: American Petroleum Institute, API. 2011.