<https://hk.ukessays.com/essays/tourism/the-operation-management-plays-a-major-role-tourism-essay.php>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hk.ukessays.com/essays/tourism/the-operation-management-plays-a-major-role-tourism-essay.php>