@article{Ogorodnikova2020excursion,
author={Ogorodnikova, O.A. and Firsova, O.G.},
title={Excursion business in Moscow and Moscow region  in the 1920s},
journal={},
publisher={INFRA-M Academic Publishing LLC.},
year={2020},
pages={45-48},
volume={5},
issue={3},
}