@book { APNRolleSchlsselbegriffvonAdvancedNursingPracticeANP,
    title = "APN Rolle. Schlüsselbegriff von Advanced Nursing Practice (ANP)",
    author = "Peter {Ullmann}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640221936",
    url = "https://www.hausarbeiten.de/document/118963"
}