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2. Brühl CA, Eltz T (2009) Fuelling the biodiversity crisis: species loss of ground-dwelling forest ants in oil palm plantations in Sabah, Malaysia (Borneo). Biodivers Conserv. doi: 10.1007/s10531-009-9596-4
3. Butler RA (2008) Palm oil industry moves into the Amazon Rainforest. Mongabay.com. Available via URL. http://news.mongabay.com/2008/0709-amazon_palm_oil.html . Accessed June 2009
4. Butler RA (2009a) Sime Darby signs palm oil deal in Liberia. Mongabay.com. Available via URL. http://news.mongabay.com/2009/0504-liberia_palm_oil.html . Accessed June 2009
5. Butler RA (2009b) Malaysian palm oil firms seek 100,000 ha in the Philippines. Mongabay.com. Available via URL. http://news.mongabay.com/2009/0608-mindanao_palm_oil.html . Accessed June 2009