1. Designing for pedestrians: a level of service concept;Fruin;Highway Research Record,1971
2. Pedestrian planning and design;Fruin,1971
3. Gerilla, G. P. (1995). Evaluation of pedestrian facilities in Central Business Districts: the case of Metro Manila, AIT Thesis no. GT 94-34, Asian Institute of Technology, Bangkok.
4. A fluid-dynamic model for the movement of pedestrians;Helbing;Complex Systems,1992
5. Self-organization phenomena in pedestrian crowds;Helbing,1997