Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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