Bernie Lau / Land Printing (1986)
Summary: This is a single-issue limited printing of 500. The author gives historical comparison of both Aikido and Aiki-Jujutsu. There are extensive photos of records and key historical figures, and a balanced synopsis about the histories of both arts.
Seigo Okamoto / Kaitensha Publications (1999)
Summary: The book contains the history of Daito-ryu and details the encounters of Sokaku Takeda and the Horikawa family. It takes you through the steps of beginning exercise as Okamoto Sensei describes them. Then it takes you to the aiki techniques (it's hard to perform them). The end section of the book contains text in Japanese with little translation and explains the concept of Ki and weight distribution. Contains techniques that are performed by Okamoto Sensei during his demonstration.
Shiro Omiya / Kodansha International (1998)
Summary: This book reviews some basic to advanced pinning and throwing techniques of Daito Ryu Aikijujutsu. It first briefly describes what are the differences in the three levels of training: Daito Ryu Jujutsu, Daito Ryu Aikijujutsu and Daito Ryu Aikijutsu. After if explains techniques classified into three main categories: Basic, Intermediate and Advanced techniques. In the first movements the author elaborates in the techniques' descriptions, while in intermediate and advanced techniques a more brief explanation is given.
Sogawa Kazuoki / 2001
Summary: This is a technical manual of Daito-Ryu waza. The cover touts the book as an "English translation," but only the photo captions are bilingual English/Japanese. All other text is Japanese only, so the reader must be Japanese-literate to realize full benefit from this book. Well illustrated.