Cita APA (7a ed.)

Sobel, I., & Wilcock, R. C. (1963). Job placement services for older workers in the United States. International Labour Organization.

Cita Chicago Style (17a ed.)

Sobel, Irvin, y Richard C. Wilcock. Job Placement Services for Older Workers in the United States. International Labour Organization, 1963.

Cita MLA (9a ed.)

Sobel, Irvin, y Richard C. Wilcock. Job Placement Services for Older Workers in the United States. International Labour Organization, 1963.