PERLAS, Caesar Ziggy. Color Enhancing, Center Spot, Rainbow and Star as Improvised Filters for DSLR Camera. JPAIR Multidisciplinary Research, Philippines, v. 27, n. 1, p. 47–97, 2017. DOI: 10.7719/jpair.v27i1.459. Disponível em: https://philair.ph/index.php/jpair/article/view/459. Acesso em: 29 apr. 2025.