A few of the books I've found to be great resources.

Art Education Textbooks

Davis Publications has a fantastic set called the Art Educator in Practice Series. I have most of these but would highly recommend the following:
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Rethinking Curriculum in Art Education
Marilyn G. Stewart and Sydney R. Walker

*For more on constructing curriculum around Enduring Ideas
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Talking about Student Art
Terry Barrett
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Assessment in Art Education
Donna Kay Beattie

Education Textbooks

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Understanding by Design
Grant Wiggins and Jay McTighe
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The Skillful Teacher
Jon Saphire

Art + Design Books

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Drawing From Life: The Journal as Art
Jennifer New
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How to be an Explorer of the World
Keri Smith
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Vitamin D: New Perspectives in Drawing
Phaidon Publications
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Vitamin P: New Perspectives in Painting
Phaidon Publications

And some others...

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Varieties of Visual Experience
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Artspeak: A Guide to Contemporary Ideas, Movements, and Buzzwords 1945 to the Present
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Artspoke: A Guide to Modern Ideas, Movements, and Buzzwords 1848-1944
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Why Design?
Anna Slafer, Kevin Cahill, National Building Museum