“Syntactic Theory of Visual Communication, Part One.” 1996. http://commfaculty.fullerton.edu/lester/writings/viscomtheory.html
“Visual Communication as a Primary System.” Journal of Visual Literacy 14:2 (1994): 11–21. http://spot.colorado.edu/~moriarts/primelang.html
Visual Communication and Visual Rhetoric sites. http://www.uiowa.edu/~commstud/resources/visual.html
"Writing Guidelines for Engineering and Science Students." http://fbox.vt.edu/eng/mech/writing/handbook/visuals.html
—compiled by Bob Corey, Lecturer, Department of English, Iowa State University