Gregg, Richard B: Gandhi's Satyagraha or Non-Violent
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- Triplicane, Madras: S. Ganesan, 1930. - 354 s.
Gregg, Richard
Bartlett: Power of Nonviolence.
- New York,: Schocken Books, 1966, - 192 s.
- http://archive.org/details/powerofnonviolen00greg
Gregg, Richard B: The Psychology and Strategy of Gandhi's
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Mahatma Gandhi: Letters to Americans / compiled and edited
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