1. . United States geological survey.; 2011. [cited: 9.09.11.].
2. . Portland Cement Association. ; 2011. [cited: 9.09.11.].
3. . United States environmental protection agency. ;2011. [cited: 9.09.11.].
4. The practicality, versatility and feasibility of utilizing recycled glass as a concrete aggregate;Verdugo,2009
5. . Wikipedia, the free encyclopedia. ; 2011. [cited: 3.04.11.].