@book{die+kleinwohnungen+der+stadt+duesseldorf+an+der+essenerstrasse+erbaut+august+1912+13,
    author = {Knopp, Nikolaus},
    title = {Die Kleinwohnungen der Stadt Düsseldorf an der Essenerstrasse : Erbaut August 1912-13},
    address = {Düsseldorf},
    publisher = {[s.n.]},
    date = {1913}
}