Start with high-confidence art books, then narrow by subgenre or adjacent topics.
Studies in Iconology
Erwin Panofsky, Gerda S. Panofsky
The Gothic Image
Emile Male, Dora Nussey
The Renaissance Artist at Work
Bruce Cole
Modernism: a Very Short Introduction
Christopher Butler
Studies in the History of the Renaissance
Walter Pater, Matthew Beaumont
Otto Dix and the Memorialization of World War I in German Visual Culture, 1914-1936
Ann Murray, Deborah Ascher Barnstone
The Madman's Gallery
Edward Brooke-Hitching