@book{PPN622645943, title = {Leitfaden der Elementar-Mathematik Teil 1}, series = {GDML\_Books}, publisher = {Schmidt}, address = {Helmstedt}, year = {1882}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN622645943} }
Dauber, Adolf. Leitfaden der Elementar-Mathematik Teil 1. GDML_Books (1882), http://gdmltest.u-ga.fr/item/PPN622645943/