Belton, Robert J. (1996). "The Elements of Art". Art History: A Preliminary Handbook. Faculty of Creative and Critical Studies: UBC's Okanagan Campus. Archived from the original on Aug 6, 2018.
web.archive.org
Belton, Robert J. (1996). "The Elements of Art". Art History: A Preliminary Handbook. Faculty of Creative and Critical Studies: UBC's Okanagan Campus. Archived from the original on Aug 6, 2018.