Das Verbrechen als soziale Erscheinung; Grundzüge der Kriminal-Sociologie (translated to English: Crime as a Social Phenomenon; Outlines of Criminal Sociology) was written by Enrico Ferri and originally published in 1884, but has undergone several revisions since then. It deals with Ferri's perspective on criminal sociology and problems of penology. The book is known as Ferri's most important work and represents the positive school of criminology. Source: Wikipedia (en)