Olusola, F. O., O. Victor, and O. M. Philips. “Geotechnical Studies of the Sub-Grade Material Beneath Akure-Ijare Highway, Ondo State, Southwestern Nigeria”. The International Journal of Science & Technoledge, vol. 3, no. 11, Nov. 2015, http://internationaljournalcorner.com/index.php/theijst/article/view/124222.