Chaisanit, Jierasak, Suradej Phanphang, Kwanjai Somboon, and Poovadee Tuchinda. “A study conducted proficiency testing of laboratory test for the compression strength of corrugated fiberboard boxes”. Bulletin of Applied Sciences 6, no. 6 (October 7, 2022): 101–107. accessed December 7, 2025. https://ph03.tci-thaijo.org/index.php/BAS/article/view/215.