Wivstad, M. (1997). Green-manure crops as a source of nitrogen in cropping systems. Swedish Univ. of Agricultural Sciences, Dep. of Crop Production Science.
Chicago-Zitierstil (17. Ausg.)Wivstad, Maria. Green-manure Crops as a Source of Nitrogen in Cropping Systems. Uppsala: Swedish Univ. of Agricultural Sciences, Dep. of Crop Production Science, 1997.
MLA-Zitierstil (9. Ausg.)Wivstad, Maria. Green-manure Crops as a Source of Nitrogen in Cropping Systems. Swedish Univ. of Agricultural Sciences, Dep. of Crop Production Science, 1997.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.