AHMADU BELLO UNIVERSITY, ZARIA
FED. UNIV. OF PETROLEUM RESOURCES, EFFURUN
FEDERAL UNIVERSITY OF TECHNOLOGY YOLA.
FEDERAL UNIVERSITY OF TECHNOLOGY, AKURE
FEDERAL UNIVERSITY OF TECHNOLOGY, MINNA.
FEDERAL UNIVERSITY OF TECHNOLOGY, OWERRI
MICHEAL OKPARA UNIVERSITY OF AGRICULTURE, UMUDIKE
NATIONAL OPEN UNIVERSITY OF NIGERIA, LAGOS.
NIGERIAN DEFENCE ACADEMY, KADUNA
NNAMDI AZIKIWE UNIVERSITY, AWKA
OBAFEMI AWOLOWO UNIVERSITY, ILE-IFE
UNIVERSITY OF ABUJA, GWAGWALADA
UNIVERSITY OF AGRICULTURE, ABEOKUTA.