APA

American Petroleum Institute A., . (2006). General purpose gear units for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2006. General purpose gear units for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2006). General purpose gear units for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . General purpose gear units for petroleum, chemical, and gas industry services. Washington: American Petroleum Institute, API. 2006.