Thanks a lot guys.
I was originally looking at these:
I understand that John Stevens has written a lot about O'sensei and aikido, and translated some aikido books from Japanese to English...?
Budo Perspectives looks like exactly what i'm interested in; i'll have to see if the library can get that encyclopedia in - or until I get a lot more money - but thanks for the recommendation as again: it's an area i'm interested in.
When i've got some money, i'll also look to get one of your books on O'sensei, Ellis.