Weethima Visalvethaya และผู้แต่งคนอื่นๆ. (2009) The development and evaluation of a model for artificial insemination by backyard pig farmers. Chulalongkorn University:ม.ป.ท.Weethima Visalvethaya และผู้แต่งคนอื่นๆ. 2009. The development and evaluation of a model for artificial insemination by backyard pig farmers. ม.ป.ท.:Chulalongkorn University;Weethima Visalvethaya และผู้แต่งคนอื่นๆ. The development and evaluation of a model for artificial insemination by backyard pig farmers. ม.ป.ท.:Chulalongkorn University, 2009. Print.