APA
Simpson B. J., Concawe & Simpson B. J. (1999). Scientific basis for an air quality standard for nickel. Brussels: Concawe.
Chicago
Simpson B J, Concawe and Simpson B J. 1999. Scientific basis for an air quality standard for nickel. Brussels: Concawe.
Harvard
Simpson B. J., Concawe and Simpson B. J. (1999). Scientific basis for an air quality standard for nickel. Brussels: Concawe.
MLA
Simpson B J, Concawe and Simpson B J. Scientific basis for an air quality standard for nickel. Brussels: Concawe. 1999.
