@book{
title = {3. cертификационный уровень },
author = {},
editor = {Andrjušina, Natalʹja P.},
editor = {998062833608896 - Trenirovočnye testy : po russkomu jazyku kak inostrannomu - 3 -  },
editor = {Sul verso del front.: Training tests of russian as a foreign language : level C1, common language },
editor = {Nome degli A. dalla cop },
year = {2015},
edition = {5-e izd},
address = {Sankt-Peterburg },
publisher = {Zlatoust},
}