@book { TeenagersinEstoniaValuesandBehaviour,
    title = "Teenagers in Estonia: Values and Behaviour",
    author = "Jaan {Mikk} and Marika {Veisson} and Piret {Luik}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107367"
}