* Ahmadu Bello University College of Agriculture, Samaru-Zaria. 1977-1978
* Rivers State University of Science and Technology, Port-Harcourt. 1979-1981
* Central Luzon State University, Munoz, Nueva Ecija, Philippines. 1983-1986
* Central Luzon State University, Munoz, Nueva Ecija, Philippines. 1986-1989
