Whalen, J. K., & Sampedro, L. Soil ecology and management.
Cita Chicago (17th ed.)Whalen, Joann K., i Luis Sampedro. Soil Ecology and Management.
Cita MLA (8th ed.)Whalen, Joann K., i Luis Sampedro. Soil Ecology and Management.
Atenció: Aquestes cites poden no estar 100% correctes.