Παραπομπή APA

Nelson, W. L., & Tisdale, S. L. (1970). Soil fertility and fertilizers (2.). Collier- Macmillan.

Παραπομπή Chicago Style

Nelson, Werner L., και Samuel L. Tisdale. Soil Fertility and Fertilizers. 2. London: Collier- Macmillan, 1970.

Παραπομπή MLA

Nelson, Werner L., και Samuel L. Tisdale. Soil Fertility and Fertilizers. 2. Collier- Macmillan, 1970.