Juntumaa, J., Laitinen, M., & Kirichenko, S. (2020). The Net Promoter Score (NPS) as a Tool for Evaluation of the User Experience at Culture and Library Services. Qualitative And Quantitative Methods In Libraries, 9(2), 127-142. Retrieved from http://qqml-journal.net/index.php/qqml/article/view/654