@book { GenreVariationinBusinessLetters,
    title = "Genre Variation in Business Letters",
    author = "Paul {Gillaerts} and Maurizio {Gotti}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1104167"
}