1. Cable N. D. McCullough B. F. and Burns N. H. (1985). "New Concepts in Prestressed Concrete Pavement " Research Report 401-2 December Center for Transportation Research the University of Texas at Austin.
2. LePree J. (2002) "Taking a Toll " Precast Solutions pp10~12.
3. Lin T. Y. and Burns N. H. (1981) Design of Prestressed Concrete Structures 3rd ed. John Wiley and Sons Inc. pp. 1-30.