Alianto, H., S. F. Wijaya, and F. Arlan. “AN ANALYSIS OF SALES INFORMATION SYSTEM AND COMPETITIVE ADVANTAGE (Study Case of UD. Citra Helmet)”. CommIT (Communication and Information Technology) Journal, vol. 6, no. 2, Oct. 2012, pp. 69-75, doi:10.21512/commit.v6i2.572.