The sources below can augment your understanding of theory and how it is used by art historians to discuss artworks of all kinds.
Oxford Art Online includes the peer-reviewed, regularly updated Grove Art Online, The Benezit Dictionary of Artists, The Oxford Companion to Western Art, The Encyclopedia of Aesthetics, and The Concise Oxford Dictionary of Art Terms, providing access to thousands of articles spanning ancient to contemporary art and architecture, as well as images of works of art, structures, plans, and artist signatures.
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“All forms of knowledge in art are intrinsically ‘theoretical,’ no matter how self-evident and commonsensical they may appear. Art is never divorced from the theorization of its meanings…As the contexts of art continue to shift and art approaches develop, as international exhibitions continue to be organized, as the role of art continues to be measured against political, economic, and technological transformations in society, so theoretical discourses continue to illuminate and ground the thinking of art.”
-- Zoya Kocur and Simon Leung, Theory in Contemporary Art since 1985 (2nd ed.). Oxford: Wiley-Blackwell, 2012, p. 3.
The author is indebted to Dr. Sara Witty for her help and feedback on this guide.