APA

United States, . (1988). Employee drug testing: regulation of drug testing laboratores. [Washington, D.C: .

Chicago

United States, . 1988. Employee drug testing: regulation of drug testing laboratores. [Washington, D.C: .

Harvard

United States, . (1988). Employee drug testing: regulation of drug testing laboratores. [Washington, D.C: .

MLA

United States, . Employee drug testing: regulation of drug testing laboratores. [Washington, D.C: . 1988.