(编). Tapping the Green Market: Certification and Management of Non-TimberForestProducts. London, UK: Earthscan Publications. 2002: 251. ISBN 1-85383-810-1
(页面存档备份,存于互联网档案馆) Institute of Forest Genetics and Tree Breeding (页面存档备份,存于互联网档案馆) Template:Non-timberforestproducts(英语:Template:Non-timberforestproducts)