APA

American Petroleum Institute A., . (1984). Guidelines for confined space work in the petroleum industry. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1984. Guidelines for confined space work in the petroleum industry. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1984). Guidelines for confined space work in the petroleum industry. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Guidelines for confined space work in the petroleum industry. Washington: American Petroleum Institute, API. 1984.