Cita APA (7a ed.)

Carkhuff, R. R. (1983). Sources of human productivity. Human Resource Development.

Cita Chicago Style (17a ed.)

Carkhuff, Robert R. Sources of Human Productivity. Amherst, Massachusetts: Human Resource Development, 1983.

Cita MLA (9a ed.)

Carkhuff, Robert R. Sources of Human Productivity. Human Resource Development, 1983.