Ping, Feng Shu, and พรอำไพสกุล นิธิอร. 2020. “A Supplementary Reading Book about Thai Studies on Currency in Circulation and Banknotes Featuring King Rama IX for Chinese Students”. Liberal Arts Review 15 (1):68-78. https://so04.tci-thaijo.org/index.php/larhcu/article/view/229377.