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T. Navaratana, C. Srisuwan, R. Sermboonsang, and A. Kwaengsopha, “The Influence of Perceived Differentiation of Used Car Dealers in San Pa Tong District, Chiang Mai Province: A Comparative Analysis across Occupation, Salary, and Car Price”, KKBSJournal, vol. 9, no. 3, pp. 1–20, Dec. 2025.