Filtra

Extra Class Language Center (San Pietroburgo / Northwestern Federal District / Russia)
International Language School Cosmopolitan (Novosibirsk / Siberian Federal District / Russia)
CompLang (Mosca / Central Federal District / Russia)
Delta - Intercontact (Tver' / Central Federal District / Russia)
Megapolis (Mosca / Central Federal District / Russia)
St. Petersburg Centre of Language and Culture (San Pietroburgo / Northwestern Federal District / Russia)
Lingua-Seasons (Mosca / Central Federal District / Russia)