ZAHARI, N.; OTHMAN , Z.; KEDIN, N. A.; AZIZ, A. A.; BAKHTIAR, M. F. S. Tipping Practices, Employee Motivation and Service Delivery Performance among 4 and 5-star Hotel Employees in Penang. Information Management and Business Review, v. 17, n. 4(I), p. 10-18, 23 Nov. 2025.