Phanwattana, P. “The Antecedent of Buying Red-Whiskered Bulbul of The Birdmen for Contest”. KKU Research Journal (Graduate Studies) Humanities and Social Sciences, vol. 7, no. 1, May 2019, pp. 12-24, https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/189816.