Abdul Halim Barkatullah. “THE DIALECTICS OF FREEDOM OF CONTRACT DOCTRINE WITH WELFARE-STATE CONCEPT IN PROVIDING LEGAL PROTECTION TO CONSUMERS”. PalArch’s Journal of Archaeology of Egypt / Egyptology, vol. 17, no. 6, Dec. 2020, pp. 7248-62, http://mail.palarch.nl/index.php/jae/article/view/1992.