Παραπομπή APA

Roy L Donahue. (1987). Soils: An introduction to soils and plant growth (5.). Prentice hall of India Private limited.

Παραπομπή Chicago Style

Roy L Donahue. Soils: An Introduction to Soils and Plant Growth. 5. New Delhi: Prentice hall of India Private limited, 1987.

Παραπομπή MLA

Roy L Donahue. Soils: An Introduction to Soils and Plant Growth. 5. Prentice hall of India Private limited, 1987.