@book { ReisebedingungenbeisptmittelalterlichenHeiligLandFahrten, title = "Reisebedingungen bei spätmittelalterlichen Heilig-Land-Fahrten", author = "Ralf {Käcks}", year = "2011", publisher = "GRIN Verlag", address = "München, Germany", doi = "10.3239/9783656060017", url = "https://www.hausarbeiten.de/document/182344" }