Paul, Suvash Chandra, and Gideon P.A.G van Zijl. “Mechanical and Durability Properties of Recycled Concrete Aggregate for Normal Strength Structural Concrete”. International Journal of Sustainable Construction Engineering and Technology, vol. 4, no. 1, July 2013, pp. 89-103, https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/647.