APA

Simpson B. J., Concawe & Simpson B. J. (1997). Scientific basis for an air quality standard for carbon monoxide. Brussels: Concawe.

Chicago

Simpson B J, Concawe and Simpson B J. 1997. Scientific basis for an air quality standard for carbon monoxide. Brussels: Concawe.

Harvard

Simpson B. J., Concawe and Simpson B. J. (1997). Scientific basis for an air quality standard for carbon monoxide. Brussels: Concawe.

MLA

Simpson B J, Concawe and Simpson B J. Scientific basis for an air quality standard for carbon monoxide. Brussels: Concawe. 1997.