Hussen, Seid, et al. “Effect of Planting Depth on Growth Performance of Maize (Zea-Mays) at the Experimental Site of Wollo University, Dessie, Ethiopia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 8, no. 1, Sept. 2013, pp. 10-15, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/1103.