CLARK II, E. H., HAVERKAMP, J. A., & CHAPMAN, W. (1985). Eroding soils: The off-farm impacts. Th Conservation Foundation.
Čikaški stil citiranja (17. izdanje)CLARK II, Edwin H., Jenniver A. HAVERKAMP, i William CHAPMAN. Eroding Soils: The Off-farm Impacts. Washington: Th Conservation Foundation, 1985.
MLA način citiranja (9. izdanje)CLARK II, Edwin H., et al. Eroding Soils: The Off-farm Impacts. Th Conservation Foundation, 1985.
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