Motokatsu Inoue. Bo, Sai, Tonfa and Nunchaku: Ancient Martial Arts of the Ryukyu Islands Vol. 1.
Motokatsu Inoue. Kama, Tekko, Tinbe and Surujin: Ancient Martial Arts of the Ryukyu Islands Vol. 2.
Phillip T. Hevener. Fujita Seiko:: The Last Koga Ninja.
Shinken Taira. Encyclopedia of Okinawan Weapons. Trans. by Eihachi Ota.Cheng Manching & Robert Smith. Tai-Chi.
Lao Tsu. Tao Te Ching. Trans. by Gia-Fu Feng and Jane English
Tchoung Ta-Tchen. The Annotated Theoretical and Practical Tai Chi Chuan.