Mikoto Masohilo Nakazono / Kototama Books (1979)
Summary: This book discusses the connections between Aikido and life philosophies with respect to the sounds of kotodama, or "kototama". The author is a life-long martial arts practitioner, and studied Aikido directly under the Founder. Barely illustrated. There are other books in this series by the same author, but not particularly relevant to aikido.