Cita APA (7a ed.)

Gill, W. R., & Vanden Berg, G. E. (1967). Soil dynamics in tillage and traction. USDA.

Cita Chicago Style (17a ed.)

Gill, William R., y Glen E. Vanden Berg. Soil Dynamics in Tillage and Traction. Washington: USDA, 1967.

Cita MLA (8a ed.)

Gill, William R., y Glen E. Vanden Berg. Soil Dynamics in Tillage and Traction. USDA, 1967.