"Roman Columns." Roman Columns. N.p., n.d. Web. 16 Feb. 2015."
‘’Architecture, Roman." Ancient Greece and Rome: An Encyclopedia for Students. Ed. Carroll Moulton. Vol. 1. New York: Charles Scribner's Sons, 1998. 53-56. World History in Context. Web. 15 Feb. 2015.’’
"Khan Academy. Valerie Sponswick, n.d. Web. 18 Feb. 2015."
"Roman Architecture." Arts and Humanities Through the Eras. Ed. Edward I. Bleiberg, et al. Vol. 2: Ancient Greece and Rome 1200 B.C.E.-476 C.E. Detroi’’
‘’Architecture, Roman." Ancient Greece and Rome: An Encyclopedia for Students. Ed. Carroll Moulton. Vol. 1. New York: Charles Scribner's Sons, 1998. 53-56. World History in Context. Web. 15 Feb. 2015.’’
"Khan Academy. Valerie Sponswick, n.d. Web. 18 Feb. 2015."
"Roman Architecture." Arts and Humanities Through the Eras. Ed. Edward I. Bleiberg, et al. Vol. 2: Ancient Greece and Rome 1200 B.C.E.-476 C.E. Detroi’’