Ayiku, Lynda, Jenny Craven, Thomas Hudson, and Paul Levay. “How to Develop a Validated Geographic Search Filter: Five Key Steps”. Evidence Based Library and Information Practice 15, no. 1 (March 13, 2020): 170–178. Accessed March 29, 2024. https://journals.library.ualberta.ca/eblip/index.php/EBLIP/article/view/29633.