1. Altman, D., Levine, L., Nadien, M., & Villena, J. (n.d.) Unpublished research, The City University of New York Graduate Center.
2. The city is not a tree;Alexander;Architectural Forum,1965
3. The nature of prejudice;Allport,1954
4. Livable streets, protected neighborhoods;Appleyard,1981
5. The environmental quality of city streets: The residents’ viewpoint;Appleyard;Journal of American Institute of Planners,1972