Pochanajun J, Jomyim T. The Factors Affecting to Performance Efficiency of Professional Tourist Guides During the Situation of the Corona Virus Infection (COVID-19) in the Area of Nakhon Sawan Province. AMJ [internet]. 2024 Jun. 30 [cited 2026 Aug. 30];8(2):510-25. available from: https://so02.tci-thaijo.org/index.php/jam/article/view/269422