Libreria De Porrua Co. Mexico, Bookdealer. Boletin Blibliografica Mexicano, June 30, 1944, Box: 19, Folder: 863. Ralph Ellis archives, MS 36. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/268832 Accessed May 19, 2024.