Piyanan Leekaew, Thaweesak Songserm, Apassara Choothesa, and Ukadej Boonyaprakob. “A Simple Method to Extract Mitochondrial DNA in a Non-invasive Phylogenetic Study of Domestic Native Thai Ducks”. Agriculture and Natural Resources, vol. 42, no. 1, Mar. 2008, pp. 41-50, https://li01.tci-thaijo.org/index.php/anres/article/view/244412.