@Article{152419,
     author = "Helmut Bonninghausen",
     title = "Osiedla robotnicze na terenie Ruhry i ich ochrona ",
     year =  1976,
     volume =  29,
     number =  3 (114),
     journal =  Ochrona Zabytków,
     pages =  s. 210-215,
    }