Tenopir, Carol. “Building Evidence of the Value and Impact of Library and Information Services: Methods, Metrics and ROI”. Evidence Based Library and Information Practice 8, no. 2 (June 12, 2013): 270–274. Accessed April 19, 2024. https://journals.library.ualberta.ca/eblip/index.php/EBLIP/article/view/19527.