H. . Subiyanto, J. . Damiri, and A. K. . Wardini, “Analysis Effect of BI Rate, Inflation, GRDP, Export Growth and Non-Performing Loans to Rural Bank (BPR) ROA in Lampung Province”, Terbuka j. of Economics and bus., vol. 2, no. 1, pp. 44–58, Mar. 2021.