เย็นบุญธรรม ป. FOOD SAFETY SITUATION, KNOWLEDGE, ATTITUDE AMONG FOOD SELLER IN THE FLEA MARKETS, PHITSANULOK PROVINCE. ptujournal [internet]. 2022 Jun. 26 [cited 2026 Sep. 14];14(1):12-27. available from: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/250570