- Author: Clifford Harper
- Language: Spanish
- Author: E. H. Gombrich, Clifford Harper
- Language: English
- Year: 2008
- Author: Freedom Press, Rob Ray, Nina Power, David Graeber, William Morris, Peter Kropotkin, Voltairine de Cleyre, Clifford Harper, Colin Ward, Joliet Schor, Bertrand Russell
- Language: English
- Year: 2018
- Author: Clifford Harper
- Language: English
Αναρχισμός
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- Author: Clifford Harper
- Language: Greek
- Year: 1989
- Author: E. H. Gombrich Clifford Harper
- Language: English
- Year: 2008