Books by Sasha M. Newman:
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Newman, Sasha M.: Pierre Bonnard: The Graphic Art (New York: Metropolitan Museum of Art, c1989), also by Colta Feller Ives and Helen Emery Giambruni, illust. by Pierre Bonnard (page images and PDF with commentary at metmuseum.org and Google)
Find more by Sasha M. Newman at your library, or elsewhere.