Billingsley, John; Visala, Arto; Dunn, Mark (2008), "Robotics in Agriculture and Forestry", Springer Handbook of Robotics (in ஆங்கிலம்), Springer Berlin Heidelberg, pp. 1065–1077, doi:10.1007/978-3-540-30301-5_47, ISBN9783540239574{{citation}}: Missing or empty |url= (help)
