Cita APA (7th ed.)

U.S. Employment Service. (1940). Oral trade questions, prepared by the United States Employment Service Division, Occupational Analysis Section. Govt. Print. Off.

Cita Chicago (17th ed.)

U.S. Employment Service. Oral Trade Questions, Prepared by the United States Employment Service Division, Occupational Analysis Section. Washington: Govt. Print. Off, 1940.

Cita MLA (9th ed.)

U.S. Employment Service. Oral Trade Questions, Prepared by the United States Employment Service Division, Occupational Analysis Section. Govt. Print. Off, 1940.