Hastenteufel, Jessica, and Sabrina Kiszka. “What Do German Bank Customers Want? The Importance of Customer Expectations and the Failure of the Integral Customer Advisory Service”. Managerial Economics 21, no. 1 (October 16, 2020): 7. Accessed May 6, 2024. https://journals.agh.edu.pl/manage/article/view/4017.