De Guzman, Roy John, and Juan Carlos Cham. “Letanía: Architectural Documentation of the Retablos of San Agustin Church in Manila”. Journal of Traditional Building, Architecture and Urbanism, no. 1 (November 20, 2020): 323 - 330. Accessed June 24, 2021. https://traditionalarchitecturejournal.com/index.php/home/article/view/358.