@book { StandardVowelSystemsofEnglishGermanandDutch,
    title = "Standard Vowel Systems of English, German, and Dutch",
    subtitle = "Variation in Norm",
    author = "Ernst-August {Müller}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01602-4",
    url = "https://www.peterlang.com/document/1046804"
}