David Norman. (1994). FAO farm systems management series N.7: Farming systems development and soil conservation. Rome: FAO.
Chicago ZitierstilDavid Norman. FAO Farm Systems Management Series N.7: Farming Systems Development and Soil Conservation. Rome: FAO, 1994.
MLA ZitierstilDavid Norman. FAO Farm Systems Management Series N.7: Farming Systems Development and Soil Conservation. Rome: FAO, 1994.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.