Nivong Sipaseuth และ Tasnee Attanandana. (2009) Site-specific nutrient management of maize in selected soils of Thailand and Lao People's Democratic Republic. Kasetsart University,:ม.ป.ท.Nivong Sipaseuth และ Tasnee Attanandana. 2009. Site-specific nutrient management of maize in selected soils of Thailand and Lao People's Democratic Republic. ม.ป.ท.:Kasetsart University,;Nivong Sipaseuth และ Tasnee Attanandana. Site-specific nutrient management of maize in selected soils of Thailand and Lao People's Democratic Republic. ม.ป.ท.:Kasetsart University, 2009. Print.