"The Effect of Imperceptible Shadows on the Judgement of Distance," Proceedings of the American Philosophical Society, 1907

"The Effect of Imperceptible Shadows on the Judgement of Distance," Proceedings of the American Philosophical Society, 1907, Box: 15. Edward Bradford Titchener papers, 14-23-545. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/48558 Accessed January 26, 2026.