Al Mousa, Heyam Abdulrahman. “Impact of Employee Efforts and Expertise on Customer Surprise, Delight and Customer Percent of Budget Spent: Moderating Role of Shopping Frequency”. Nexo Revista Científica 36, no. 04 (September 30, 2023): 653–666. Accessed December 5, 2025. https://camjol.info/index.php/NEXO/article/view/16791.