Donbanthao , A. ., Benjawan , K. . and Ariuea, P. . (2021) “The Development of Product Cost Reduction Process and Product design of Fermented Mushrooms of Pracharak Sueksa School, Khlong Khlung District, Kamphaeng Phet Province ”, PAYAP UNIVERSITY JOURNAL, 30(2), pp. 58–71. doi: 10.14456/pyuj.2020.18.