1. The Building Regulations—Approved Document B;Department of The Environment and the Welsh Office,1991
2. Safety in football stadia; a method of assessment;Poyner,1972
3. Guide to Safety at Sports Grounds;Home Office/Scottish Office,1991
4. Passenger flows in subways;Hankin;Operational Res. Quart.,1958
5. Pedestrian Planning and Design;Fruin,1971