Dictionary of occupational titles.
Selected characteristics of occupations. Supplement [1]-2.

APA Citation

United States Employment Service., United States. Bureau of Employment Security. (196668). Dictionary of occupational titles: Selected characteristics of occupations. Supplement [1]-2. 3d ed. Washington: U.S. Govt. Print. Off..

MLA Citation

United States Employment Service, and United States. Bureau of Employment Security. Dictionary of Occupational Titles: Selected Characteristics of Occupations. Supplement [1]-2. 3d ed. Washington: U.S. Govt. Print. Off., 196668.