Good links for iBooks Author tutorials.

http://www.educatorstechnology.com/2012/06/simple-guide-for-teachers-to-create.html

http://m.youtube.com/watch?feature=plpp&v=utycWBJOG08

http://m.youtube.com/watch?feature=plpp&v=UjEYWA_0wuw

http://m.youtube.com/watch?feature=plpp&v=S3hnfm-4554

Below is a link to a free manual

http://www.freetech4teachers.com/2012/06/free-110-page-guide-to-publishing-with.html#.UQALEB2YvTo