Walker, Charles R. (Charles Rumford), 1893-1974. "Teaching Languages in a Hurry" Reader's Digest, Box 1, Folder 5, Item 12, Robert L. Owen Collection, 1913-1946. https://fraser.stlouisfed.org/archival/5300/item/535391, accessed on April 24, 2024.
Walker, Charles R. (Charles Rumford), 1893-1974. "Teaching Languages in a Hurry" Reader's Digest, Box 1, Folder 5, Item 12, Robert L. Owen Collection, 1913-1946. https://fraser.stlouisfed.org/archival/5300/item/535391, accessed on April 24, 2024.