APA

American Petroleum Institute A., . (2013). Corrosion resistant, bolted bonnet gate valves - flanged and butt-welding ends. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2013. Corrosion resistant, bolted bonnet gate valves - flanged and butt-welding ends. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2013). Corrosion resistant, bolted bonnet gate valves - flanged and butt-welding ends. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Corrosion resistant, bolted bonnet gate valves - flanged and butt-welding ends. Washington: American Petroleum Institute, API. 2013.