B.C. Asogwa, J.C. Ihemeje and J.A.C. Ezihe
Agricultural Journal 6 ( 5 ): 243 - 251 , 2011
V.A. Okwoche, B.C. Asogwa and D.T. Waya
The Social Sciences 8 ( 5 ): 393 - 397 , 2013