1. Anderson, L. (2006). Which Witch is Which? A Feminist Analysis of Terry Pratchett’s Discworld Witches (Unpublished Master’s Thesis). Sweden: University of Halmstad.
2. Beauvoir, S. D. (1989). The Second Sex. London: Vintage Books.
3. Burrows, M. (2020). The Magic of Terry Pratchett. Great Britain: White Owl.
4. Butler, A. (2001). The Pocket Essential: Terry Pratchett. Great Britain: Cox and Wyman.
5. Butler, A. (2004). Theories of Humour. In Andrew M. Butler et.al., (Eds.), Terry Pratchett: Guilty of Literature (pp. 67-89). Baltimore: Old Earth Books.