References
- Cory, P (1991). 65 Drunkard's path quilt designs. Mineola, NY: Dover.
- Lee, X. (2023, February 28). The 17 wallpaper groups. http://xahlee.info/Wallpaper_dir/c5_17WallpaperGroups.html.
- Schattschneider, D. (1978). The plane symmetry groups: Their recognition and notation. The American Mathematical Monthly, 85(6), 439–450. https://doi.org/10.1080/00029890.1978.11994612
- Shepherd, M. D., Belcastro, S-M., & Yackel, C. A(2011). ‘Group actions in cross-stitch’. In S-M. Belcastro, C. A. Yackel, A.K. Peters (Eds.), Crafting by concepts, (pp. 110–139). Natick, MA.