1. Official Methods of Analysis;AOAC,1984
2. Official Methods of Analysis;AOAC,1990
3. Der Gehalt des Futters an umsetzbarer Energie;Axelsson;Züchtungskunde,1941
4. Bernes, G., Turner, T., Stengärde, L., Pickova, J., 2009. Feeding only forage - good for humans but not always for sheep. 1st Nordic Organic Conference, Gothenburg, May 18–20, p. 155.
5. Hemp as food at high latitudes;Callaway;J. Ind. Hemp,2002