พันธุ์วัฒนา พ. (2017) “The Five Freedoms: Factors Affacting of Red - Whiskered Bulbul Birdmen in Habitat”, Parichart Journal, 30(2), pp. 275–294. available at: https://so05.tci-thaijo.org/index.php/parichartjournal/article/view/105051 (accessed: 14 September 2026).