Free Download Color ordered : a survey of color order systems fr… By Schwarz, Andreas; Kuehni, Rolf G Publisher Oxford University Press 2008 ISBN..

Free Download Color : an introduction to practice and principles… By Kuehni, Rolf G Publisher Wiley 2012 ISBN 1118173848,978-1-118-17384-8,9781118533543,1118533542,9781118533567,1118533569..