Melli, ‏​‏​‏​​‏​‏​​‏​‏​‏​‏​‏​‏ Ali. “Effect of Different Tillage Systems in Some Soil Physical Properties, Operation Costs of Machines and Yield of Wheat Crop”. Arab Journal for Sciences and Research Publishing, vol. 2, no. 2, Mar. 2016, p. 107, https://doi.org/10.26389/AJSRP.L14216.