REFERENCES :

https://www.slideshare.net/JeweldelMundo/wikang-pambansa-65672888

https://tl.m.wikipedia.org/wiki/Wikang_Filipino

https://ejournals.ph/article.php?id=7949

https://tl.m.wikipedia.org/wiki/Mga_wika_sa_Pilipinas

http://unityharmonytranquilitydestiny.blogspot.com/2013/06/ang-pinagmulan-ng-wikang-filipino.html?m=1