Παραπομπή APA

Nelson, W. L., & Tisdale, S. L. (1956). Soil fertility and fertilizers. Mac Millan Company.

Παραπομπή Chicago Style

Nelson, Werner L., και Samuel L. Tisdale. Soil Fertility and Fertilizers. USA: Mac Millan Company, 1956.

Παραπομπή MLA

Nelson, Werner L., και Samuel L. Tisdale. Soil Fertility and Fertilizers. Mac Millan Company, 1956.