SIMS, B. G., RÖTTGER, Alexandra and MKOMWA, Saidi, 2011, Hire services by farmers for farmers [online]. 2011. Rome : Rural Infrastructure and Agro-Industries Division, Food and Agriculture Organization of the United Nations. [Accessed 28 March 2025]. ISBN 978-92-5-107072-7. Retrieved from: http://www.fao.org/docrep/015/i2475e/i2475e00.pdf