APA

Simpson B. J., Concawe, Health Management groups, Simpson B. J. & Health Management groups. (1993). Industrial hygiene seminar. Brussels: Concawe.

Chicago

Simpson B J, Concawe, Health Management groups, Simpson B J and Health Management groups. 1993. Industrial hygiene seminar. Brussels: Concawe.

Harvard

Simpson B. J., Concawe, Health Management groups, Simpson B. J. and Health Management groups. (1993). Industrial hygiene seminar. Brussels: Concawe.

MLA

Simpson B J, Concawe, Health Management groups, Simpson B J and Health Management groups. Industrial hygiene seminar. Brussels: Concawe. 1993.