@book { TriathlonimSchulsport,
    title = "Triathlon im Schulsport",
    author = "Ingo {Westermann}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640723423",
    url = "https://www.hausarbeiten.de/document/158712"
}