Dyfyniad APA

Bear, F. E. (1938). Theory and practices in the use of fertilizers (2.). John Wiley & Sons INC.

Dyfyniad Arddull Chicago

Bear, Firman E. Theory and Practices in the Use of Fertilizers. 2. NewYork: John Wiley & Sons INC, 1938.

Dyfyniad MLA

Bear, Firman E. Theory and Practices in the Use of Fertilizers. 2. John Wiley & Sons INC, 1938.

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