Special Approaches or Topics About Art Historians Explanatory Texts Kleinbauer, W. Eugene, and Thomas P. Slavens. Research Guide to the History of Western Art . American Library Association, 1982. Kleinbauer, W. Eugene.
Lengthy introduction explains various methodologies which are then illustrated by essays.
Principles of Art History. Schlosser, Julius von. Quellenkunde der neuern Kunstgeschichte. A important early source for methodology, although not complete in the Italian translation. Contains an extensive bibliography of older, classical sources for the study of historiography.