APA

American Petroleum Institute A., . (2004). Recommended practice for use and procedures for inspection, maintenance, and repair of drilling and well servicing structures. 4G. 3rd. ed. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2004. Recommended practice for use and procedures for inspection, maintenance, and repair of drilling and well servicing structures. 4G. 3rd. ed. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2004). Recommended practice for use and procedures for inspection, maintenance, and repair of drilling and well servicing structures. 4G. 3rd. ed. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Recommended practice for use and procedures for inspection, maintenance, and repair of drilling and well servicing structures. 4G. 3rd. ed. Washington: American Petroleum Institute, API. 2004.