Yahya, A. ., D. Rubiyanto, and I. Fatimah. “Heterogeneous Catalytic Conversion of Citronellal into Isopulegol and Menthol: Literature Review”. Science and Technology Indonesia, vol. 6, no. 3, July 2021, pp. 166-80, doi:10.26554/sti.2021.6.3.166-180.