Analysis of information sources in references of the Wikipedia article "ILR scale" in English language version.
**ACTFL (American Council on the Teaching of Foreign Languages) and ILR (Interagency Language Roundtable) estimated equivalencies provided by a certified ACTFL administrator.
**ACTFL (American Council on the Teaching of Foreign Languages) and ILR (Interagency Language Roundtable) estimated equivalencies provided by a certified ACTFL administrator.