1. Abeles, F. F. (2005). Lewis Carroll’s formal logic. History and Philosophy of Logic, 26, 33–46.
2. Abeles, F. F. (2005). Lewis Carroll’s ciphers: The literary connections. Advances in Applied Mathematics, 34, 697–708.
3. Alice www.hrc.utexas.edu/exhibitions/…/carroll/lc7.html
4. Charles Dodgson and Lewis Carroll: A Double Life www.poictesme.com/charles-dodgson-and-lewis-carroll/
5. Charles Lutwidge Dodgson www.aprender-mat.info/ingles/historyDetail.htm?id=Dodgson