"Republic Act No. 9718". Official Gazette of the Republic of the Philippines. 14 October 2009. Archived from the original on 22 August 2020. Retrieved 22 August 2020.
"Republic Act No. 11170"(PDF). Official Gazette of the Republic of the Philippines. 3 January 2019. Archived from the original(PDF) on 22 August 2020. Retrieved 22 August 2020.
"R.A. No. 4309". The Corpus Juris. 19 June 1965. Archived from the original on 22 August 2020. Retrieved 22 August 2020.
web.archive.org
"R.A. No. 4309". The Corpus Juris. 19 June 1965. Archived from the original on 22 August 2020. Retrieved 22 August 2020.
"Republic Act No. 9718". Official Gazette of the Republic of the Philippines. 14 October 2009. Archived from the original on 22 August 2020. Retrieved 22 August 2020.
"Republic Act No. 11170"(PDF). Official Gazette of the Republic of the Philippines. 3 January 2019. Archived from the original(PDF) on 22 August 2020. Retrieved 22 August 2020.