Filtra

St. Petersburg Centre of Language and Culture (San Pietroburgo / Northwestern Federal District / Russia)
Lenda - Center (San Pietroburgo / Northwestern Federal District / Russia)
Inlingua - Moscow (Mosca / Central Federal District / Russia)
Lingua-Seasons (Mosca / Central Federal District / Russia)
Linguistic Centre - Cambridge (Novosibirsk / Siberian Federal District / Russia)
LLC Petrion Russian in Petersburg (San Pietroburgo / Northwestern Federal District / Russia)
American Club of Education (Mosca / Central Federal District / Russia)
American Language Master (San Pietroburgo / Northwestern Federal District / Russia)
Baikal - Lingua Language & Travel Center (Akademgorodok / Siberian Federal District / Russia)