Sywulka, Edward F., "The Morphology of the Mam Language of Guatemala, Central America,", 1948

Sywulka, Edward F., "The Morphology of the Mam Language of Guatemala, Central America,", 1948, Box: 4, Folder: 39. Nora England Papers, 2023-17. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/395292 Accessed September 26, 2026.