Soil and Water Conservation Society (U.S.), World Association of Soil and Water Conservation, Soil Science Society of America, & Lal, R. (1991). Soil management for sustainability. Soil and Water Conservation Society in cooperation with the World Association of Soil and Water Conservation and the Soil Science Society of America.
Παραπομπή σε μορφή Chicago (17η εκδ.)Soil and Water Conservation Society (U.S.), World Association of Soil and Water Conservation, Soil Science Society of America, και R. Lal. Soil Management for Sustainability. Ankeny: Soil and Water Conservation Society in cooperation with the World Association of Soil and Water Conservation and the Soil Science Society of America, 1991.
Παραπομπή σε μορφή MLA (9th εκδ.)Soil and Water Conservation Society (U.S.), et al. Soil Management for Sustainability. Soil and Water Conservation Society in cooperation with the World Association of Soil and Water Conservation and the Soil Science Society of America, 1991.