Bautista, R. “Ibarra R. Crisostomo, MD (1958-2021) A Tribute to Our Colleague”. Philippine Journal of Otolaryngology Head and Neck Surgery, vol. 36, no. 2, Nov. 2021, p. 61, https://pjohns.pso-hns.org/index.php/pjohns/article/view/1829.