- Author: Karl Liebknecht
- Language: English
- Year: 1973
- Author: Rosa Luxemburgo & Karl Liebknecht
- Language: Spanish
- Year: 2009
- Author: Rosa Luxemburgo & Karl Liebknecht
- Language: Spanish
- Year: 2009
- Author: Rosa Luxemburgo & Karl Liebknecht
- Language: Spanish
- Year: 2009