APA

American Petroleum Institute A., . (2022). Recommended practice for pipeline operator qualification (OQ). Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 2022. Recommended practice for pipeline operator qualification (OQ). Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (2022). Recommended practice for pipeline operator qualification (OQ). Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Recommended practice for pipeline operator qualification (OQ). Washington: American Petroleum Institute, API. 2022.