Kittidecha, C., Punyawong , J. , Kampinkam , N. and Rattanadilok Na Phuket, E. 2022. Reducing The Number of Delayed Deliveries Through Production Planning and Management: A Case Study of Hill Tribe Cocoa Cof Co., Ltd. Rajamangala University of Technology Tawan-ok Research Journal. 15, 1 (Jun. 2022), 31–40.