- Thorvaldsson, G.; Bergstrom, L.; Gerzabek, M.; Andren, O.; Eriksson, L.O.;
Winninge, M. (2008). "Fundamentals of
Organic Agriculture – Past and Present" (PDF)...
- Lars Bergström;
Martin Gerzabek; Olof Andrén; Lars-Olov Eriksson;
Mikael Winninge (2008).
Holger Kirchmann and Lars Bergström (ed.).
Organic Crop Production...