Norman Hudson. (1991). FAO soils bulletin N.64: A study of the reasons for success or failure of soil conservation projects. Rome: FAO.
استشهاد بنمط شيكاغوNorman Hudson. FAO Soils Bulletin N.64: A Study of the Reasons for Success or Failure of Soil Conservation Projects. Rome: FAO, 1991.
MLA استشهادNorman Hudson. FAO Soils Bulletin N.64: A Study of the Reasons for Success or Failure of Soil Conservation Projects. Rome: FAO, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.