@article{lejpt15059,
 author={I. Agbede Manasseh, O. a. J.},
 year={2009},
 title={Suitability of Periwinkle Shell as Partial Replacement for River Gravel in Concrete},
 journal={Leonardo Electron. J. Pract. Technol.},
 volume={8},
 number={15},
 pages={59-66},
 url={http://lejpt.academicdirect.org/A15/059_066.pdf}
}