Sales, Paul Ryan, 		Ferrer, Dorothy Emma, 		Calacal, Gayvelline, 		Salvador, Jazelyn, AND 		De Ungria, Maria Corazon.
" Validation of Two Extraction Methods for Human DNA from Cigarette Butts" <em>Science Diliman: A Journal of Pure and Applied Sciences</em> [Online], Volume 31 Number 1 (12 June 2019)