APA

American Petroleum Institute A., . (2015). Closed die forgings for use in the petroleum and natural gas industry. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2015. Closed die forgings for use in the petroleum and natural gas industry. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2015). Closed die forgings for use in the petroleum and natural gas industry. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Closed die forgings for use in the petroleum and natural gas industry. Washington: American Petroleum Institute, API. 2015.