APA

United States, . (2012). General industry digest. [Washington, D.C.?]: U. S. Dept. of Labor, Occupational Safety and Health Administration.

Chicago

United States, . 2012. General industry digest. [Washington, D.C.?]: U. S. Dept. of Labor, Occupational Safety and Health Administration.

Harvard

United States, . (2012). General industry digest. [Washington, D.C.?]: U. S. Dept. of Labor, Occupational Safety and Health Administration.

MLA

United States, . General industry digest. [Washington, D.C.?]: U. S. Dept. of Labor, Occupational Safety and Health Administration. 2012.