Hardenburg, W. E. (1912). The Putumayo: The devil's paradise. Travels in the peruvian Amazon region and an account of the atrocities committed upon the indians therein, together with extracts from the report of Sir Rogers Casement confirming the occurrences. T. Fisher Unwin.
Cita Chicago (17th ed.)Hardenburg, W. E. The Putumayo: The Devil's Paradise. Travels in the Peruvian Amazon Region and an Account of the Atrocities Committed upon the Indians Therein, Together with Extracts from the Report of Sir Rogers Casement Confirming the Occurrences. London, England, United Kingdom: T. Fisher Unwin, 1912.
Cita MLA (9th ed.)Hardenburg, W. E. The Putumayo: The Devil's Paradise. Travels in the Peruvian Amazon Region and an Account of the Atrocities Committed upon the Indians Therein, Together with Extracts from the Report of Sir Rogers Casement Confirming the Occurrences. T. Fisher Unwin, 1912.