Visibility and the Private Automobile:

Rapaille, Clotaire. The Culture Code: An Ingenios Way to Understand Why People Around the World Buy and Live As They Do. New York: Broadway Books, 2006.

Lavin,Sylvia. “Richard Neutra and the Psychology of the American Spectator” Grey Room No. 1. (Autumn, 2000), pp. 42-63. http://links.jstor.org/sici?sici=15263819%28200023%290%3A1%3C42%3ARNATPO%3E2.0.CO%3B2-A

Subways:

"Architectual Design." Sunlight Direct. 22 Jan. 2008 <http://www.sunlight-direct.com/overview.html>. 

Webb, Ann R. "Consideration for the Lighting Enviroment: Non-Visual Effect of Light." Energy and Building (2006):  721-727. ScientificDirect. 22 Jan.-Feb. 2008. 

Rich, Sarah. "Sunlight Subway Project." Inhabita. 27 Aug.-Sept. 2007. 22 Jan. 2008 <http://www.inhabitat.com/2007/08/21/subway-light-project/>.