Παραπομπή APA

Orlov, D. . S. (1985). Humus acids of soils. Oxonian press.

Παραπομπή Chicago Style

Orlov, D S. Humus Acids of Soils. New Delhi: Oxonian press, 1985.

Παραπομπή MLA

Orlov, D S. Humus Acids of Soils. Oxonian press, 1985.