APA

American Petroleum Institute A., . (1994). Guidelines for confined space entry on board tank ships in the petroleum industry. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1994. Guidelines for confined space entry on board tank ships in the petroleum industry. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1994). Guidelines for confined space entry on board tank ships in the petroleum industry. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Guidelines for confined space entry on board tank ships in the petroleum industry. Washington: American Petroleum Institute, API. 1994.