Kijpruek M, Ruangchoengchum P. Measurement Service Productivity: The Case Study of the Wedding Photography Businesses in Khon Kaen Province. ecbajournal [internet]. 2024 Oct. 30 [cited 2026 Sep. 12];16(4):195-212. available from: https://so01.tci-thaijo.org/index.php/ecbatsu/article/view/267641