R. Abdul Haris, Inayatusshobah, Agustina Pujiastutik. “THE EFFECT OF SERVICE QUALITY AND PRICE ON USER LOYALTY CONTRACTOR SERVICES PT. HADI JAYA BORE LAND SURABAYA”. PalArch’s Journal of Archaeology of Egypt / Egyptology, vol. 18, no. 7, Apr. 2021, pp. 2025-37, https://www.archives.palarch.nl/index.php/jae/article/view/8360.