1. Bernacki H, Haman J, Kanfojki CZ. 1972. Agricultural machines; theory and construction (Vol. 1, pp. 382–387). Warsaw, Poland: The Scientific Publications Foreign Cooperative. Center of Central Institute for Scientific Technical and Information.
2. The effect of tine arrangement on soil forces and disturbance;Godwin;Journal of Agriculture Engneering Research,1984
3. Rotary-tiller design parameters, part I. Direction of rotation;Hendrick;Transactions of the ASAE,1971
4. Ikemi T, Sakai J. 1990. The three-point hitching system of a rotary tilling tractor for paddy cultivation. In Proceedings of the International Agricultural Engineering Conference and Exhibition, Bangkok, Thailand (Vol. I, pp. 277–286).
5. Johnson L. 1965. Traction problems in flooded rice soils. ASAE Paper No. 65-124. St. Joseph, MI: American Society of Agricultural Engineers.