APA

American Petroleum Institute A., . (1991). Combustible gas detector systems and environmental and operational factors influencing their performance. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1991. Combustible gas detector systems and environmental and operational factors influencing their performance. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1991). Combustible gas detector systems and environmental and operational factors influencing their performance. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Combustible gas detector systems and environmental and operational factors influencing their performance. Washington: American Petroleum Institute, API. 1991.