I. Andersson, Esrey, S. A., Sawyer, R., et Hillers, A.,
Closing the loop : ecological sanitation for food security, vol. no. 18. Stockholm, Sweden: SIDA, Swedish International Development Cooperation Agency, 2001, p. vi, 96 p. : 22 fig., 2 tab.
C. Werner, Schlick, J., Witte, G., et Hildebrandt, A.,
« Ecosan : closing the loop in wastewater management and sanitation : proceedings of the international symposium, 30-31 October 2000, Bonn, Germany ». Deutsche Gesellschaft fur Technische Zusammenarbeit (GTZ), Eschborn, Germany, p. iv, 318 p. : fig., tab., 2001.