Chammearc, H. B., and P. . Astuty. “The Effect Of Investment, Work Force, And Education Level On The Real Growth Of GRDP In The Bangka Belitung Islands”. Journal Research of Social Science, Economics, and Management, vol. 2, no. 11, June 2023, pp. 2580-8, doi:10.59141/jrssem.v2i11.472.