Sticher, Hans (August 2002). "Soil Science and Soil Scientists in Switzerland (1855–1962)"(PDF). Newsletter of the Committee on the History, Philosophy, and Sociology of Soil Science, International Union of Soil Sciences and Council on the History, Philosophy, and Sociology of Soil Science, Soil Science Society of America (10): 12–14. Archived from the original(PDF) on 2007-09-28. Retrieved 2007-08-25.
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Sticher, Hans (August 2002). "Soil Science and Soil Scientists in Switzerland (1855–1962)"(PDF). Newsletter of the Committee on the History, Philosophy, and Sociology of Soil Science, International Union of Soil Sciences and Council on the History, Philosophy, and Sociology of Soil Science, Soil Science Society of America (10): 12–14. Archived from the original(PDF) on 2007-09-28. Retrieved 2007-08-25.
