<https://www.wikihow.vn/T%E1%BA%AFt-th%C3%B4ng-b%C3%A1o-WhatsApp-tr%C3%AAn-Android>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.wikihow.vn/T%E1%BA%AFt-th%C3%B4ng-b%C3%A1o-WhatsApp-tr%C3%AAn-Android>