Kreitner, R. &. O. (1990). Business. Houghton.
Cita Chicago (17th ed.)Kreitner, Robert & Others. Business. Houghton, 1990.
Cita MLA (9th ed.)Kreitner, Robert & Others. Business. Houghton, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.