Quitoy JER, Garcia DAC, Subade RF, Eluriaga LMT. Estimating tourism losses due to COVID-19 Pandemic: The case of Puerto Princesa underground river, Philippines. DRJ [Internet]. 2024 Jun. 17 [cited 2024 Jun. 26];15(2):66-77. Available from: https://davaoresearchjournal.ph/index.php/main/article/view/189