MARSHALL, Elaine and CHANDRASEKHARAN, Cherukat, 2009, Non-farm income from non-wood forest products [online]. 2009. Rome : Rural Infrastructure and Agro-Industries Division, Food and Agriculture Organization of the United Nations. [Accessed 27 March 2025]. ISBN 978-92-5-106140-4. Retrieved from: ftp://ftp.fao.org/docrep/fao/011/i0527e/i0527e.pdf