@book { Marketingstrategiesineducationpublishedinrussian,
    title = "Marketing strategies in education (published in russian)",
    author = "Olga {Frik} and Alexander {Kovalev} and Tatyana {Ivashkevich} and Vasiliy {Kovalev}",
    year = "2014",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/312796"
}