Dyfyniad APA

Tisdale, S. (1975). Soil fertility and fertilizers. Macmillan Company.

Dyfyniad Arddull Chicago

Tisdale, S.L. Soil Fertility and Fertilizers. New York: Macmillan Company, 1975.

Dyfyniad MLA

Tisdale, S.L. Soil Fertility and Fertilizers. Macmillan Company, 1975.

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