Many Internet resources on "Kashima-Shinryū" in fact refer to a style of aikido (also called“Kashima noTachi”), rather thanKashima-Shinryū proper. The only official online resource regarding the details of Kashima-Shinryū is the official Federation homepage. Please be especially careful of YouTube videos: there are a few unauthorised videos of proper Kashima-Shinryū, but most of the links will be to aikido practices.

You may also wish to read:

Legacies of the Sword: The Kashima-Shinryu and Samurai Martial Culture by Karl F. Friday and SEKI Humitake (1997; ISBN 0-8248-1879-2)

Kashima-Shinryū Federation of Martial Sciences 2019