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- Language: English
- Year: 2004

- Author: Weldon Michael
- Language: English
- Year: 1996

- Author: Holthausen Ferdinand
- Language: German
- Year: 1954

- Author: Schleef Wilhelm
- Language: German
- Year: 1967

- Author: Cerroni Umberto, Gramsci Antonio, Lindt Adria, Gramsci Antonio
- Language: German
- Year: 1979

- Author: Anatoly Cherepovski
- Language: English
- Year: 2008

- Author: DeBaggio Thomas, Tucker Arthur O., DeBaggio Francesco
- Language: English
- Year: 2009

- Author: Walter A. Elwell
- Language: English
- Year: 1984

- Author: March Jennifer R
- Language: English
- Year: 1998

- Author: Mechler Ernst, Mueller Markus S
- Language: English
- Year: 2005