| Author: | Ferri, Enrico, 1856-1929 |
| Subject: | HX, Socialism, Evolution, Spencer, Herbert, 1820-1903 |
| Format: | Electronic text |
| Date issued: | 2017 |
| Language: | Spanish |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Socialismo y ciencia positiva (Darwin-Spencer-Marx) [electronic resource] / Enrico Ferri |