APA
WHO Study Group on New Approaches to Improve Road Safety, . (1989). New approaches to improve road safety. Geneva: WHO.
Chicago
WHO Study Group on New Approaches to Improve Road Safety, . 1989. New approaches to improve road safety. Geneva: WHO.
Harvard
WHO Study Group on New Approaches to Improve Road Safety, . (1989). New approaches to improve road safety. Geneva: WHO.
MLA
WHO Study Group on New Approaches to Improve Road Safety, . New approaches to improve road safety. Geneva: WHO. 1989.