M. I. M. Nasution, Sabaruddin Chaniago, Prof. M. Shabri A. Majid, Ph.D, and Dr. Marliyah, M.A, Dr. Rita Handayani, M.Si, “Comparison Study Of Usd, Euro, Gold Dinar Exchange On The Rupiah Exchange In 2009 – 2012”, enrichment, vol. 12, no. 2, pp. 2038-2047, May 2022.