Não informado. (1955). Personnel Management Abstracts. University of Michigan, Graduate School of Business Administration.
Lua i Stíl Chicago (17ú heag.)Não informado. Personnel Management Abstracts. Ann Arbor, Mich: University of Michigan, Graduate School of Business Administration, 1955.
Lua MLA (8ú heag.)Não informado. Personnel Management Abstracts. University of Michigan, Graduate School of Business Administration, 1955.
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