APA

American Petroleum Institute A., . (1990). API exposure classification scheme for collection of industrial hygiene monitoring data. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1990. API exposure classification scheme for collection of industrial hygiene monitoring data. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1990). API exposure classification scheme for collection of industrial hygiene monitoring data. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . API exposure classification scheme for collection of industrial hygiene monitoring data. Washington: American Petroleum Institute, API. 1990.