Sawangsapp S. Development guidelines of marketing mix strategy of clean food business among women of working age in Ratchaburi Province. JMSNPRU [Internet]. 2019 Jan. 13 [cited 2024 Apr. 27];5(2):30-44. Available from: https://so03.tci-thaijo.org/index.php/JMSNPRU/article/view/166017