Não informado. (1964). Soil and water. National Water and Soil Conservation Organization.
Cita Chicago Style (17a ed.)Não informado. Soil and Water. Wellington: National Water and Soil Conservation Organization, 1964.
Cita MLA (8a ed.)Não informado. Soil and Water. National Water and Soil Conservation Organization, 1964.
Precaución: Estas citas no son 100% exactas.