1. 2012 ACTFL proficiency guidelines http://www.actfl.org/sites/default/files/pdfs/ACTFLProficiencyGuidelines
2. 2011 21 st century skills map: World languages https://www.actfl.org/sites/default/files/pdfs/21stCenturySkillsMap/p21_worldlanguagesmap.pdf
3. Teaching Spanish to the native speaker at the college level;Aparicio;Hispania,1983