Dümüller, Urs (2007). Defining the Subject of English as a Foreign Langauge (EFL). In: Popov, Nikolay; Wolhuter, Charl; Leutwyler, Bruno; Kysilka, Marcella; Černetič, Metod (Hg.) Comparative Education, Teacher Training and New Education Agenda (S. 61-66). Sofia: Bureau for Education Services