Tanruean, K., R. Chutima, R. Chaiyen, and S. Wittanalai. “EFFICIENCY OF KERATINASE ENZYME PRODUCING BACTERIA ISOLATED FROM SOIL OF POULTRY FARMING FOR DEGRADATION OF CHICKEN FEATHER”. Life Sciences and Environment Journal, vol. 20, no. 1, Jan. 2019, pp. 19-29, https://ph01.tci-thaijo.org/index.php/psru/article/view/141144.