Stanley, Denise, Robert Voeks, and Leaa Short. “Is Non-Timber Forest Product Harvest Sustainable in the Less Developed World? A Systematic Review of the Recent Economic and Ecological Literature”. Ethnobiology and Conservation 1 (October 11, 2012). Accessed April 12, 2024. http://www.ethnobioconservation.com/index.php/ebc/article/view/19.