- Author: Karl Liebknecht
- Language: English
- Year: 1973
- Author: Paul Lafargue Wilhelm Liebknecht
- Language: English
- Year: 1943
- Author: Rosa Luxemburgo & Karl Liebknecht
- Language: Spanish
- Year: 2009
- Author: Wilhelm Liebknecht
- Language: German
- Year: 1891
- Author: Wilhelm Liebknecht
- Language: German
- Year: 1887
- Author: Rosa Luxemburgo & Karl Liebknecht
- Language: Spanish
- Year: 2009
- Author: Liebknecht Karl
- Language: English
- Year: 2012
- Author: Rosa Luxemburgo & Karl Liebknecht
- Language: Spanish
- Year: 2009