Kubicki, Kathy and Bajac, Quentin and Torre, de la, Alfonso and Knorr, Karen (2012) Karen Knorr. In: Karen Knorr. La Fabricia, Madrid, Spain, pp. 31-47. ISBN 9788415303664 Item not available online.

Kubicki, Kathy and Bajac, Quentin and Torre, de la, Alfonso and Knorr, Karen (2011) Karen Knorr. Coleccion El Ojo Que Ves, 5 . La Fabricia, Madrid, Spain. ISBN 9788415303664