Stout, T. G., & Cowan, A. (2007). Japanese katakana for beginners: First steps to mastering the Japanese writing system. Tuttle Publishing.

Stout, Timothy G., and Alexis Cowan. Japanese Katakana for Beginners: First Steps to Mastering the Japanese Writing System. North Clarendon, Vermont: Tuttle Publishing, 2007.

Stout, Timothy G., and Alexis Cowan. Japanese Katakana for Beginners: First Steps to Mastering the Japanese Writing System. Tuttle Publishing, 2007.