Koller, A. (1979). Work, power and efficiency. Wiley eastern ltd.
Dyfyniad Arddull ChicagoKoller, Alois. Work, Power and Efficiency. New Delhi: Wiley eastern ltd, 1979.
Dyfyniad MLAKoller, Alois. Work, Power and Efficiency. Wiley eastern ltd, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.