Hashemi, Seyed Mohammad. “Clay Minerals Deposit of Halakabad (Sabzevar- Iran)”. International Journal on Advanced Science, Engineering and Information Technology 2, no. 2 (April 2, 2012): 135–137. Accessed July 22, 2024. https://ijaseit.insightsociety.org/index.php/ijaseit/article/view/170.