Hinterher merkt man, daß es richtig war, daß es schiefgegangen ist. Nachkriegs- Erfahrungen im Ruhrgebiet. ( = Lebensgeschichte und Sozialkultur im Ruhrgebiet 1930 bis 1960, 2) .
Books can be attributed to "Unknown" when the author or editor (as applicable) is not known and cannot be discovered. If at all possible, list at least one actual author or editor for a book instead of using "Unknown".
Books whose authorship is purposefully withheld should be attributed instead to Anonymous.