APA

American Petroleum Institute A., . (1998). Recommended practice for drill stem design and operating limits. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1998. Recommended practice for drill stem design and operating limits. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1998). Recommended practice for drill stem design and operating limits. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Recommended practice for drill stem design and operating limits. Washington: American Petroleum Institute, API. 1998.