«L'ajuda mútua és tant una llei de la vida animal com la lluita mútua.»
Text de l'edició incorporada · anglès
«Mutual aid is as much a law of animal life as mutual struggle.»
— Piotr Kropotkin, Mutual Aid: A Factor of Evolution
Cita aquesta obra
- APAPiotr Kropotkin. (n.d.). Mutual Aid: A Factor of Evolution. SigPhi. https://sigphiai.com/ca/works/peter-kropotkin/mutual-aid-a-factor-of-evolution
- MLAPiotr Kropotkin. "Mutual Aid: A Factor of Evolution." SigPhi, https://sigphiai.com/ca/works/peter-kropotkin/mutual-aid-a-factor-of-evolution.
- ChicagoPiotr Kropotkin. Mutual Aid: A Factor of Evolution. SigPhi. https://sigphiai.com/ca/works/peter-kropotkin/mutual-aid-a-factor-of-evolution.