Nikorn Thongtip และ Anuchai Pinyopummin. (2008) Potential factors affecting semen quality in Asian elephant (Elephas maximus). Kasetsart University:ม.ป.ท.Nikorn Thongtip และ Anuchai Pinyopummin. 2008. Potential factors affecting semen quality in Asian elephant (Elephas maximus). ม.ป.ท.:Kasetsart University;Nikorn Thongtip และ Anuchai Pinyopummin. Potential factors affecting semen quality in Asian elephant (Elephas maximus). ม.ป.ท.:Kasetsart University, 2008. Print.