Athanase, N., R. Vicky, M. N. Jayne, and H. Sylvestre. 2013. “Soil Acidification and Lime Quality: Sources of Soil Acidity, Its Effects on Plant Nutrients, Efficiency of Lime and Liming Requirements”. Agricultural Advances 2 (9):259-69. http://sjournals.com/index.php/aa/article/view/740.