Carkhuff, R. R. (1983). IPS, interpersonal skills and human productivity. Human Resource Development.
Cita Chicago Style (17a ed.)Carkhuff, Robert R. IPS, Interpersonal Skills and Human Productivity. Amherst, Massachusetts: Human Resource Development, 1983.
Cita MLA (9a ed.)Carkhuff, Robert R. IPS, Interpersonal Skills and Human Productivity. Human Resource Development, 1983.
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