Rohmana, Dana, and Nur Cahyadi. “Analysis of Whatsapp Based Online Services Effectivity at Kmu Madura Eye Clinic”. Eqien - Jurnal Ekonomi dan Bisnis 11, no. 04 (December 27, 2022): 43 – 48. Accessed August 27, 2026. https://www.stiemuttaqien.ac.id/ojs/index.php/OJS/article/view/1201.