APA

American Petroleum Institute A., . (2012). Specification for drilling and production hoisting equipment (PSL 1 and PSL 2). Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2012. Specification for drilling and production hoisting equipment (PSL 1 and PSL 2). Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2012). Specification for drilling and production hoisting equipment (PSL 1 and PSL 2). Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Specification for drilling and production hoisting equipment (PSL 1 and PSL 2). Washington: American Petroleum Institute, API. 2012.