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2. Farmers' Seed Production. New Approaches and Practices;Almekinders,1999
3. Barrera-Bassols, N., 2003. Symbolism, knowledge and management of soil and land resources in indigenous communities: ethnopedology at global, regional and local scales. Unpublished PhD thesis. Faculty of Science, University of Ghent, Belgium.
4. Ethnopedology in a Worldwide Perspective: An Annotated Bibliography. ITC Publications 77;Barrera-Bassols,2000
5. Ethnopedology: a worldview on the soil knowledge of local people;Barrera-Bassols;Geoderma,2003