APA

American Petroleum Institute A., . (1977). Recommended guidelines for documentation of training. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1977. Recommended guidelines for documentation of training. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1977). Recommended guidelines for documentation of training. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Recommended guidelines for documentation of training. Washington: American Petroleum Institute, API. 1977.