@book { Das5MinutenHighIntensityTraining,
    title = "Das 5-Minuten-High-Intensity-Training",
    subtitle = "Mehr Muskeln und weniger Fett in vier Wochen. Give me Five! Inklusive kostenlosem Online-Video-Coaching.",
    author = "Manuel {Eckardt}",
    year = "2018",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/439176"
}