APA

American Petroleum Institute A., . (2003). Recommended practice for training and qualification of drilling fluid technologists. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2003. Recommended practice for training and qualification of drilling fluid technologists. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2003). Recommended practice for training and qualification of drilling fluid technologists. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Recommended practice for training and qualification of drilling fluid technologists. Washington: American Petroleum Institute, API. 2003.