@book{ title = "Die Urkunden Friedrichs II.", author = "Friedrich,Koch, Walter,Höflinger, Klaus,Spiegel, Joachim,Friedl, Christian,Gutermuth, Katharina", year = "2017", publisher = "Harrassowitz Verlag", address = "Wiesbaden", language = "ger","lat", howpublished = "print", isbn = "9783447107532", keywords = "Quelle", pages = "29.7 cm x 21 cm", series = "Array, Tomus 14, pars 5,1", }