2Edward R. Ford. The Details of Modern Architecture[M]. Cambridge, Mass: MIT Press, 1990: 352.
3Gottfried Semper. The Four Elements of Architecture and Other Writings[M]. Harry Francis Mallgrave and Wolfgang Herrmann trans. New York: Cambridge University Press, 1989.
4Gottfried Semper. Style in the Technical and Tectonic Arts; or, Practical Aesthetics[M]. Harry Mallgrave, Michael Robinson trans. Los Angeles: Getty Research Institute, 2004.
