Rosita, S., Prasetya , N., Susanti , W. D., Rivaldo , W., Akbar , G. A., Pamungkas , B. L., Trinugroho , C. W. and Astrianty, L. E. (2021) “Web Engineering to Develop Service Systems in Online Bookstores”, International Journal of Engineering Technology and Natural Sciences, 3(2), pp. 89 - 94. doi: 10.46923/ijets.v3i2.141.