Wadsworth Atheneum, Barter, J. A., & Gaddis, E. R. (1987). American drawings and watercolors from the Wadsworth Atheneum: Judith A. Butler. With an introduction by Eugene R. Gaddis. Hudson Hills.
Lua i Stíl Chicago (17ú heag.)Wadsworth Atheneum, Judith A. Barter, agus Eugene R. Gaddis. American Drawings and Watercolors from the Wadsworth Atheneum: Judith A. Butler. With an Introduction by Eugene R. Gaddis. New York: Hudson Hills, 1987.
Lua MLA (8ú heag.)Wadsworth Atheneum, et al. American Drawings and Watercolors from the Wadsworth Atheneum: Judith A. Butler. With an Introduction by Eugene R. Gaddis. Hudson Hills, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.