Hafni Sahir, S., Afriani, J., Ginting, G., Fachri, B., Siregar, D., Simbolon, R., Lindawati, L., Syarizal, M., Mesran, M., Fadlina, F., & Simarmata, J. (2018). The Preference Selection Index Method in Determining the Location of Used Laptop Marketing. International Journal of Engineering and Technology, 7(3.4), 260-263. https://doi.org/10.14419/ijet.v7i3.4.19869