D. G. K. Nabella, I. G. M. Sanjaya, and S. Suyatno, “Learning Module on Buffer Material with a CRT Approach to Solve Problem Topics in Jombang Typical Coffee Beer-Drink”, IJORER  Int. J. Recent Educ. Res., vol. 5, no. 1, pp. 106-116, Jan. 2024.