I don't see any books listed at Manifold System - The ultimate GIS and Mapping Product! but there is a lot of information; for third-party Manifold resources I would check the discussion list at --
Manifold-L - GIS Discussion
I remember there was a Manifold user community web site but I haven't been there for over a year and forget the name.

ESRI has a lot of books and training options, there may even be some courses available at your university --
ESRI Training and Education

Eric