• http://repository.unizik.edu.ng/handle/123456789/1247
• http://repository.unizik.edu.ng/handle/123456789/1248
• http://repository.unizik.edu.ng/handle/123456789/1249
• http://repository.unizik.edu.ng/handle/123456789/1250
• http://repository.unizik.edu.ng/handle/123456789/1254
• http://repository.unizik.edu.ng/handle/123456789/1255
• http://repository.unizik.edu.ng/handle/123456789/1259
• http://repository.unizik.edu.ng/handle/123456789/1265
• http://repository.unizik.edu.ng/handle/123456789/1266
• http://repository.unizik.edu.ng/handle/123456789/1267
• http://repository.unizik.edu.ng/handle/123456789/1268
• http://repository.unizik.edu.ng/handle/123456789/1269
• http://repository.unizik.edu.ng/handle/123456789/1270