This is a new paper released by the State Education Agency Directors of Arts Education describing the unique roles and contributions of Certified Arts Educators, Certified Non-Arts Educators, and Non-Certified Providers of Supplemental Arts Instruction.

Association for Supervision and Curriculum Development (ASCD):
Digital Policy Brief--Reaching for a Well-Rounded Education Creates Challenges for Educators (2011)

This policy brief from ASCD provides good support for the arts as part of a well-rounded education.