Gufron, D. M. (2021). Unregistered Marriage and the Legal Impact, A Book Review “Kepastian Hukum Perkawinan Siri dan Permasalahannya” Zainuddin SH MH & Afwan Zanuddin SH MH, Deepublish Yogyajarta, 95 Pages, ISBN: 978-602-435-120-1. Indonesian Journal of Advocacy and Legal Services, 3(2), 257-262. https://doi.org/10.15294/ijals.v3i2.34776