Rat Kings: General Sources
- "The Rat," presumably by J. Erskine Clarke, article in The Children's Prize, No. 2, February 1868. Pg. 19. Online: https://books.google.com/books?id=dCUGAAAAQAAJ&pg=PA19&dq=%22rat+king%22&hl=en&sa=X&ved=0ahUKEwjF-vzo2IHdAhVohlQKHdvzCnY4ChDoAQhBMAU#v=onepage&q=%22rat%20king%22&f=false
- "King of the Rats," by W.W. Spicer, article in Hardwicke's Science-Gossip, June 1, 1866 London, England. Pgs. 135-136. Online: https://books.google.com/books?id=RrkWAQAAIAAJ&pg=RA6-PP11&dq=Rattenk%C3%B6nig&hl=en&sa=X&ved=0ahUKEwjmn9OI4YHdAhWRK3wKHdQADkgQ6AEIWTAI#v=onepage&q=Rattenk%C3%B6nig&f=false