• https://ugspace.ug.edu.gh/items/194aaff0-be23-4e31-849c-1ca3290e93fc
• https://ugspace.ug.edu.gh/items/9b7bc4a8-5396-45ad-bbc9-a619efcfcfab
• https://ugspace.ug.edu.gh/items/61354cdd-0e15-4482-81ee-51df8efe7fd0