@article{lejpt25135,
 author={Oritola, S. and Saleh, A. L. and R. Mohd Sam, A.},
 year={2014},
 title={Comparison of different forms of gravel as aggregate in concrete},
 journal={Leonardo Electron. J. Pract. Technol.},
 volume={13},
 number={25},
 pages={135-144},
 url={http://lejpt.academicdirect.org/A25/135_144.pdf}
}