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Sills, Erin O. and Holmes, Thomas P. and Pattanayak, Subhrendu K. (2003) Nontimber Forest Products in the Rural Household Economy. In: Forests in a Market Economy. Kluwer Academic, The Netherlands, pp. 259-281. ISBN 978-1-4020-1028-6

Sills, Erin O. and Lele, Sharachchandra and Holmes, Thomas P. and Pattanayak, Subhrendu K. (2003) Nontimber Forest Products in the Rural Household Economy. In: Forests in a Market Economy. Forestry Sciences. Kluwer Academic Publishers., Printed in The Netherlands., pp. 259-281.