Vestabilivy, Evi, and Fitria Prihatini. “Health Service Problems in Umrah Congregations: Evi Vestabilivy, Fitria Prihatini”. Jurnal Persada Husada Indonesia, vol. 7, no. 27, Oct. 2020, pp. 46-53, doi:10.56014/jphi.v7i27.307.