1. Adiv, A., 1983. The structure of the work trip based on analysis of trip diaries in the San Francisco bay area. In: S. Carpenter and P. Jones (eds), Recent Advances in Travel Demand Analysis, pp. 117?136. Aldershot, Hants, England. Gower Publishing Company. Ltd.
2. Allaman, P.M., T.J. Tardiff & F.C. Dunbar, 1982. New Approaches to Understanding Travel Behavior. National Research Council, Washington, D.C.
3. BMDP Statistical Software 1981. University of California Press, Los Angeles, CA.
4. Brog, W. & A.H. Meyburg, 1981. The non-response problem in travel surveys: An empirical investigation. Transportation Research Record #775: 34?38.
5. Chapin, S.S., 1974. Human Activity Pattern in the City. New York: John Wiley and Sons.