1. Ernährungsbericht 1984, DGE, S 36
2. Schall H (1949) Nahrungsmitteltabelle. Barth Verlag, Leipzig
3. Watt BK, Merrill AL (1950) Agriculture handbook No 8. US Dep Agric Washington, DC, pp 32?37
4. Med Res Counc Spec Rep Ser No;RA McCance,1960
5. Watt BK, Merrill AL (1963) Agriculture handbook No 8, US Dep Agric Washington, DC