APA

Simpson B. J., Concawe & Simpson B. J. (1993). Guidelines for the health surveillance of workers exposed to benzene in the petroleum industry. Brussels: Concawe.

Chicago

Simpson B J, Concawe and Simpson B J. 1993. Guidelines for the health surveillance of workers exposed to benzene in the petroleum industry. Brussels: Concawe.

Harvard

Simpson B. J., Concawe and Simpson B. J. (1993). Guidelines for the health surveillance of workers exposed to benzene in the petroleum industry. Brussels: Concawe.

MLA

Simpson B J, Concawe and Simpson B J. Guidelines for the health surveillance of workers exposed to benzene in the petroleum industry. Brussels: Concawe. 1993.