Saleh, Ahlam A., Melissa A. Ratajeski, and Marnie Bertolet. “Grey Literature Searching for Health Sciences Systematic Reviews: A Prospective Study of Time Spent and Resources Utilized”. Evidence Based Library and Information Practice 9, no. 3 (September 6, 2014): 28–50. Accessed March 29, 2024. https://journals.library.ualberta.ca/eblip/index.php/EBLIP/article/view/20629.