Filtra

Extra Class Language Center (San Pietroburgo / Northwestern Federal District / Russia)
St. Petersburg Centre of Language and Culture (San Pietroburgo / Northwestern Federal District / Russia)
ABC International Language & Training School (San Pietroburgo / Northwestern Federal District / Russia)
Delta - Intercontact (Tver' / Central Federal District / Russia)
Deutsche Zentrale für Tourismus (Mosca / Central Federal District / Russia)
Lingua-Seasons (Mosca / Central Federal District / Russia)
Linguistic Centre - Cambridge (Novosibirsk / Siberian Federal District / Russia)