M. R. Baltes, “Factors Influencing Nondiscretionary Work Trips by Bicycle Determined from 1990 U.S. Census Metropolitan Statistical Area Data, Transportation Research Record 1538,” Transportation Research Board, Washington DC, 1996, pp. 96-101.
 M. Replogle, “Integrating Pedestrian and Bicycle Factors into Regional Transportation Planning Models: Summary of the State-Of-The-Art and Suggested Steps Forward,” Urban Design, Telecommunication and Travel Forecasting Conference: Summary, Recommendations and Compendium of Papers, Travel Model Improvement Program, Williamsburg, 27-30 October, 1996, pp. 75-94.
 K. J. Crifton and K. J. Krizek, “The Utility of the NHTS in Understanding Bicycle and Pedestrian Travel,” National Household Travel Survey Conference: Understanding Our Nation’s Travel, 1-2 November, 2004 Washington DC.
 R. Cervero and M. Duncan, “Walking, Bicycling, and Urban Landscapes: Evidence from the San Francisco Bay Area,” American Journal of Public Health, Vol. 93, No. 9, 2003, pp. 1478-1483. doi:10.2105/AJPH.93.9.1478
 A. Cotrus, J. N. Prashker and Y. Shiftan, “Spatial and Temporal Transferability of Trip Generation Demand Models in Israel, Bureau of Transportation Statistics,” Journal of Transportation and Statistics, Vol. 8 No. 1, 2003, pp. 37-56.
 J. L. Mwakalonge, “Econometric Modeling of Total Urban Travel Demand Using Data Collected in Single and Repeated Cross-Sectional Surveys,” Ph.D. Dissertation, Department of Civil and Environmental Engineering, Tennessee Technological University, Cookeville, 2010.
 G. F. Ulfarsson and V. N. Shankar, “Children’s Travel to School: Discrete Choice Modeling of Correlated Motorized and Non-Motorized Transportation Modes Using Covariance Heterogeneity,” Environment and Planning B: Planning and Design, Vol. 35, No. 2, 2008, pp. 195-206. doi:10.1068/b3360
 A. Hadayeghi, A. S. Shalaby, B. N. Persaud and C. Cheung, “Temporal Transferability and Updating of Zonal Level Accident Prediction Models,” Accident Analysis & Prevention, Vol. 38, No. 3, 2006, pp. 579-589. doi:10.1016/j.aap.2005.12.003