@book { PracticalResearchMethodsAGuideforPostSecondaryResearchers,
    title = "Practical Research Methods. A Guide for Post-Secondary Researchers",
    author = "Sixbert {SANGWA}",
    year = "2021",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/1024522"
}