Matthew Ramandri A, Susanto S, Yusuf W Y. Proposed Service Quality Improvement at Aya Travel using SERVQUAL Method and Importance Performance Analysis. Improsci [Internet]. 2024 Jun. 16 [cited 2026 Sep. 11];1(6):297-305. Available from: https://annpublisher.org/ojs/index.php/improsci/article/view/309