1. R. Ahmad, M I Malik, M U Jan, P Ahmad, H Seth, J Ahmad Brick (2014), Masonry and Hollow Concrete Block Masonry – A Comparative Study, Vol. 1, Issue 1, pp (14-21), Month: October 2013-March 2014
2. S R. De Silva Chandrakeerthy. (1991), Compressive Strength Test for Low-Strength Cement Blocks, Journal of Structural Engineering, Vol. 117, Issue 3 (March 1991)
3. S M. Palmquist, D C. Jansen, and C W. Swan Compressive, (2001), Behavior of Concrete with Vitrified Soil Aggregate.“ Journal of Materials in Civil Engineering Volume 13, Issue 5 ,October 2001, pp (389-394)
4. of concrete masonry units with plastic bottle cores, Thesis for graduation of Master of Science degree, Department: Department of Architectural Engineering and Construction;Wonderlich;Kansas State University, supervisors Professor: Kimberly Waggle Kramer and Bill Zhang, Publication Date,2014