State University of New York
College at Oneonta: Polyclitus Canon, Idea of Symmetria
This site provides a very detailed summary of the Canon of Polyclitus, a written work concerning sculpture and art.
Washington State University
Washington State University: Architecture in the Italian Renaissance
This site contains information on how Italian Renaissance architecture found its roots in the ancient world, the principles it rested on, and some key figures in its development.
University of Chicago
Encyclopeaedia Romana: The Doryphoros of Polyclitus
This site provides a picture and description of Polyclitus' most famous work. Includes ancient commentary of this important work of art.