Johnson, Marjorie C. et al. Modern Foreign Languages: A Counselor's Guide. U.S. Department of Health, Education, and Welfare Office of Education Bulletin 1960, No. 20. Washington: Government Printing Office, 1960

Johnson, Marjorie C. et al. Modern Foreign Languages: A Counselor's Guide. U.S. Department of Health, Education, and Welfare Office of Education Bulletin 1960, No. 20. Washington: Government Printing Office, 1960, Box: 83. George I. Sánchez Papers, 23866736. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/541548 Accessed September 27, 2026.