Chiarawatchai, N., and C. Nuengjamnong. “The Use of Earthworms in Lab-scale Constructed Wetlands to Treat Swine Wastewater”. The Thai Journal of Veterinary Medicine, vol. 39, no. 2, July 2015, pp. 157-62, https://he01.tci-thaijo.org/index.php/tjvm/article/view/35870.