1. American Council on the Teaching of Foreign Languages. (2014).Global competence position statement.https://www.actfl.org/news/position‐statements/global‐competence‐position‐statement
2. American Council on the Teaching of Foreign Languages. (n.d.).Teach grammar as a concept in context: How to approach grammar in language instruction.https://www.actfl.org/educator‐resources/guiding‐principles‐for‐language‐learning/teach‐grammar‐as‐a‐concept‐in‐context
3. Handbuch zur deutschen Grammatik
4. [Deutsch macht Spaß!: An easy‐to‐understand German grammar review with Hagar® and Peanuts® cartoons in German, by B.S. Dubiel];Baker J. K.;Die Unterrichtspraxis/Teaching German,2013
5. [Mittelpunkt B2. Grammatiktrainer, by C. Breslauer, S. Dengler, I. Sander, & J. Skrodzki];Barbe K.;Die Unterrichtspraxis/Teaching German,2010