Ngā kupu hautoa kōpae
Tohutoro APA (7th ed.)
Estados Unidos Department of Agriculture. (1921). Field operations of the bureau of soils. U.S.Department of Agriculture.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
Tohutoru Kātū Chicago (17th ed.)
Estados Unidos Department of Agriculture. Field Operations of the Bureau of Soils. U.S.Department of Agriculture, 1921.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
Tohutoro MLA (9th ed.)
Estados Unidos Department of Agriculture. Field Operations of the Bureau of Soils. U.S.Department of Agriculture, 1921.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
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