Não informado. (1949). Abstracts of recent published material on soil and water conservation. Agricultural Research Service, Soil and Water Conservation Division.
Cytowanie według stylu Chicago (wyd. 17)Não informado. Abstracts of Recent Published Material on Soil and Water Conservation. Washington: Agricultural Research Service, Soil and Water Conservation Division, 1949.
Cytowanie według stylu MLA (wyd. 8)Não informado. Abstracts of Recent Published Material on Soil and Water Conservation. Agricultural Research Service, Soil and Water Conservation Division, 1949.
Uwaga: Te cytaty mogą odróżniać się od wytycznej twojego fakultetu..