David Norman. (1994). FAO farm systems management series N.7: Farming systems development and soil conservation. Rome: FAO.
استشهاد بنمط شيكاغوDavid Norman. FAO Farm Systems Management Series N.7: Farming Systems Development and Soil Conservation. Rome: FAO, 1994.
MLA استشهادDavid Norman. FAO Farm Systems Management Series N.7: Farming Systems Development and Soil Conservation. Rome: FAO, 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.