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Edwards, S.E., Nebel, S. and Heinrich, M. (2005) Questionnaire surveys: methodological and epistemological problems for field-based ethnopharmacologists. Journal of Ethnopharmacology, 100 (1-2). pp. 30-36. 10.1016/j.jep.2005.05.026 .
Edwards, S.E., Nebel, S. and Heinrich, M. (2005) Methodological and epistemological considerations on the use of questionnaires in ethnopharmacology. Journal of Ethnopharmacology, 100 . pp. 30-36. 10.1016/j.jep.2005.05.026.