Lapeña, José Florencio F. “Authorship Controversies: Gift, Guest and Ghost Authorship”. Philippine Journal of Otolaryngology Head and Neck Surgery 34, no. 1 (June 18, 2019): 4–5. Accessed May 2, 2024. https://pjohns.pso-hns.org/index.php/pjohns/article/view/957.