- Author: Robert A. Karl
- Language: English
- Year: 2017
Ler Marx!
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- Author: Robert Kurz Karl Marx
- Language: Portuguese
- Author: Robert Kalaba Karl Spingarn (auth.)
- Language: English
- Year: 1982
- Author: Robert Litteral Karl J. Franklin
- Language: English
- Year: 1993
- Author: Robert A. Karl
- Language: English
- Year: 2017
- Author: Robert A. Karl
- Language: English
- Year: 2017
- Author: Bruce Bahmani Robert Napton Karl Altstaetter
- Language: English
- Year: 2005
- Author: Robert Gardner Karl G. Heider Margaret Mead
- Language: English
- Year: 1969
- Author: Robert Kalaba Karl Spingarn (auth.)
- Language: English
- Year: 1982
