APA

American Petroleum Institute A., . (1985). Bulletin on directional drilling survey calculation methods and terminology. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1985. Bulletin on directional drilling survey calculation methods and terminology. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1985). Bulletin on directional drilling survey calculation methods and terminology. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Bulletin on directional drilling survey calculation methods and terminology. Washington: American Petroleum Institute, API. 1985.