1
by Hönigswald, Richard
Published 1926
Vieweg+Teubner Verlag

2
by Wojcieszuk, Magdalena Anna
Published 2010
Centaurus Verlag & Media

3
by Schöffel, Georg
Published 1987
VS Verlag für Sozialwissenschaften

4
by Arslan, Cüneyt
Published 2014
Springer Vienna