Scully, Vincent Jr. (1959). "Louis Sullivan's Architectural Ornament: A Brief Note concerning Humanist Design in the Age of Force". Perspecta. 5: 73–80. doi:10.2307/1566883. JSTOR1566883.
Scully, Vincent Jr. (1959). "Louis Sullivan's Architectural Ornament: A Brief Note concerning Humanist Design in the Age of Force". Perspecta. 5: 73–80. doi:10.2307/1566883. JSTOR1566883.