@book { OrthographicSystemsinThirteenEditionsoftheKalenderofShepherdes15061656,
    title = "Orthographic Systems in Thirteen Editions of the «Kalender of Shepherdes» (1506–1656)",
    author = "Hanna {Rutkowska}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02024-3",
    url = "https://www.peterlang.com/document/1046273"
}