Cita APA (7th ed.)

U. S. Employment Service. (1949). Dictionary of occupational titles. Govt. Print. Off.

Cita Chicago (17th ed.)

U. S. Employment Service. Dictionary of Occupational Titles. Washington: Govt. Print. Off, 1949.

Cita MLA (9th ed.)

U. S. Employment Service. Dictionary of Occupational Titles. Govt. Print. Off, 1949.