Rohmana D, Cahyadi N. Analysis of Whatsapp Based Online Services Effectivity at Kmu Madura Eye Clinic. Eqien [Internet]. 2022 Dec. 27 [cited 2026 Oct. 3];11(04):43 – 48. Available from: https://stiemuttaqien.ac.id/ojs/index.php/OJS/article/view/1201