Bingham, J. (2004). Medieval world. Usborne.
Child, H. (1966). Heraldic design. Heraldic Bks.
The Editors of Encyclopaedia Britannica. (1998, July 20). Heraldry - the historical development of heraldry. In The Encyclopaedia Britannica. Encyclopaedia Britannica. Retrieved January 13, 2021, from https://britannica.com/topic/heraldry/The-historical-development-of-heraldry
Encyclopedia Japan. (n.d.). Kamon symbols of Japan. Encyclopedia Japan. Retrieved January 13, 2021, from https://doyouknowjapan.com/symbols
Gibson, M. (1979). The knights. Arco Publishing Company.
Gwynn-Jones, P. L. (1998). The art of heraldry: Origins, symbols, designs. Prospero Books.
Hall of Names Ltd. (n.d.). Heraldry symbols and what they mean. Hall of Names. Retrieved January 13, 2021, from https://hallofnames.org.uk/heraldry-symbols-and-what-they-mean/
Heraldry. (1998). In The world book encyclopedia (Vol. 9, pp. 194-196). World Book.
von Volborth, C.-A. (1991). The art of heraldry. Tiger Books International.
Wilcox, K. R. (2020). The Drawshield.net guide to blazonry [Reference Poster]. Drawshield.net. Retrieved January 13, 2021, from https://drawshield.net/resources/poster.html