Lubis, D. A., and Y. C. . Anam. “Siklus Bisnis Ekspor Minyak Kelapa Sawit Nasional: Analisis Rantai Markov Dan Model Data Panel”. Journal of Analytical Research, Statistics and Computation, vol. 2, no. 1, Mar. 2023, pp. 40-62, doi:10.4590/jarsic.v2i1.15.