<https://unizik.edu.ng/bulletin-issn-1595-1685-july-31-2017-vol-10-no-25/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://unizik.edu.ng/bulletin-issn-1595-1685-july-31-2017-vol-10-no-25/>