Spencer, E. G. (1992). Police and the social order in German cities: The Düsseldorf District, 1848 - 1914. Northern Illinois Univ. Press.
Chicago-Zitierstil (17. Ausg.)Spencer, Elaine Glovka. Police and the Social Order in German Cities: The Düsseldorf District, 1848 - 1914. DeKalb, Ill: Northern Illinois Univ. Press, 1992.
MLA-Zitierstil (9. Ausg.)Spencer, Elaine Glovka. Police and the Social Order in German Cities: The Düsseldorf District, 1848 - 1914. Northern Illinois Univ. Press, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.