Yasuo Muroi gives online animation classes. There's a link on his twitter - https://twitter.com/animesijyuku . You can read some impressions from the course on the Anipages forum here - http://www.pelleas.net/forum/viewtopic.php?f=1&t=832 .
I don't know any books by Japanese animators, but the older ones used Preston Blair's Cartoon Animation. And in an interview Toshiyuki Inoue said good things about The Animator's Survival Kit and The Illusion of Life. Also the documentary Yasuo Otsuka's Joy In Motion is quite educational.