
Gottlob Frege
pdf
- Author: Hans D. Sluga
- Language: English
- Year: 1980

- Author: Robert J. Fogelin
- Language: English
- Year: 1995

Karl Marx
pdf
- Author: Allen W. Wood
- Language: English
- Year: 2004

- Author: Peter Hylton
- Language: English
- Year: 2007

- Author: Peter Hylton
- Language: English
- Year: 2007

- Author: Timothy O'Hagan
- Language: English
- Year: 1999

- Author: Barry Stroud
- Language: English
- Year: 1981

- Author: Margaret Dauler Wilson
- Language: English
- Year: 2005

- Author: Stephen Priest
- Language: English
- Year: 1998