FEBY FW, Amir Makhmud Zain Nst, Rusli Effendi Damanik. Pengaruh Kualitas Pelayanan dan Kepuasan Jamaah Umroh terhadap Loyalitas Jamaah di PT. Gadikah Mandiri Islami Travel Medan. ilman [Internet]. 2025Mar.3 [cited 2026Apr.29];13(1):9-14. Available from: https://www.journals.lppm-sukma.id/index.php/ilman/article/view/797