@book{freiburg+donaueschingen+singen+hoellentalbahn+basel+saeckingen+schaffhausen+singen+konstanz,
    author = {Herzog, Albert},
    title = {Freiburg, Donaueschingen, Singen, Höllentalbahn : Basel, Säckingen, Schaffhausen, Singen, Konstanz},
    address = {Frankfurt a. M.},
    publisher = {Expedition von Hendschels Telegraph, M. Hendschel},
    date = {1911}
}