Anwar K, Rizqi MA. VALIDITY AND RELIABILITY ANALYSIS OF ASSESSMENT FOR CUSTOMER SATISFACTION AT UNIVERSITY OF MUHAMMADIYAH GRESIK. DIDAK TIKA [Internet]. 2018 Jan. 4 [cited 2026 Jun. 15];22(2):141-52. Available from: https://journal.umg.ac.id/index.php/didaktika/article/view/221