When I got my degrees it was in the dark ages, I got my BA in art and one
in secondary education. I did not have any text that combined the two. I do
teach with two younger teachers that seemed to have a more combined education.
I will try to contact them and see what they have to say. It may not be easy
since we are all (finally) on vacation.
I would recommend "Art and Cognition, Intergrating the Visual Arts in the
Curriculum," by Arthur D. Efland isbn 0-8077-4218-X paper, or 0-8077-4219-8
cloth). This book is a good introduction of art education theories. "Emphasis
in Art," has come up on the list a lot recently as a good resource to new
teachers. I think it is out of print, though.