Bakar RM, Ayu F, Nadjamuddin L. Is Service with a Smile Enough to Satisfy Customers? Sincere and Insincere Smiles via Video and Vignette. gamaijb [Internet]. 2023May2 [cited 2024Nov.30];25(2):121-42. Available from: https://jurnal.ugm.ac.id/v3/gamaijb/article/view/15803