References

Books

Ueshiba, Kisshomaru. Aikido. Tokyo: Hozansha, 1974.

Ratti, Oscar & Westbrook, Adele. Aikido and the Dynamic Sphere. Tuttle, 1970.

Websites

Aikido Journal (aikidojournal.com)

Daitō-ryū Aiki-jūjutsu (daito-ryu.org)