Cita APA (7th ed.)

(1979). Conversion table of code and title changes, third to fourth edition, Dictionary of occupational titles / U.S. Department of Labor, Employment and Training Administration, U.S. Employment Service.

Cita Chicago (17th ed.)

Conversion Table of Code and Title Changes, Third to Fourth Edition, Dictionary of Occupational Titles / U.S. Department of Labor, Employment and Training Administration, U.S. Employment Service. 1979.

Cita MLA (9th ed.)

Conversion Table of Code and Title Changes, Third to Fourth Edition, Dictionary of Occupational Titles / U.S. Department of Labor, Employment and Training Administration, U.S. Employment Service. 1979.