Vassana Viroonrat และ Thaworn Onpraphai. (2011) Risk assessment to degradation of mandarin cv. Sai Nam Pueng orchards using topographical and soil property under management factors :. Chiang Mai University,:ม.ป.ท.Vassana Viroonrat และ Thaworn Onpraphai. 2011. Risk assessment to degradation of mandarin cv. Sai Nam Pueng orchards using topographical and soil property under management factors :. ม.ป.ท.:Chiang Mai University,;Vassana Viroonrat และ Thaworn Onpraphai. Risk assessment to degradation of mandarin cv. Sai Nam Pueng orchards using topographical and soil property under management factors :. ม.ป.ท.:Chiang Mai University, 2011. Print.