Vijarn Laothamyingyong. 1999. District planning process in Ubonratchathani province, Thailand. Institute of Graduate Studies, Central Luzon State University;
Vijarn Laothamyingyong. (1999) District planning process in Ubonratchathani province, Thailand . Central Luzon State University/Munoz, Nueva Ecija.
Vijarn Laothamyingyong. District planning process in Ubonratchathani province, Thailand. . Munoz, Nueva Ecija:Central Luzon State University, 1999.
Vijarn Laothamyingyong. (1999) District planning process in Ubonratchathani province, Thailand . Central Luzon State University/Munoz, Nueva Ecija.