Keller, Alisa, and Jürgen Moormann. “The Challenge to Determine a Company’s Process Maturity: A Case Study from the Financial Services Industry”. European Journal of Management Issues 25, no. 2 (June 25, 2017): 85-91. Accessed January 19, 2020. https://mi-dnu.dp.ua/index.php/MI/article/view/150.