APA Style
Dictionary of occoupational titles. (1977).
Washington, D.C.:
US Department of Labor.
Chicago Style
Dictionary of occoupational titles.
4th ed..
Washington, D.C.:
US Department of Labor,
1977.
.
MLA Style
Dictionary of occoupational titles.
4th ed..
Washington, D.C.:
US Department of Labor,
1977.
.
Turabian Style
Dictionary of occoupational titles.
Washington, D.C.:
US Department of Labor,
1977.
.