@book { QualittsmanagementinderTherapie,
    title = "Qualitätsmanagement in der Therapie",
    author = "Walter {Leal Filho}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18351",
    url = "https://www.peterlang.com/document/1144484"
}