1. Turning Point Project. Who plays God in the 21st century? (Paid Advertisement by Turning Point Project on behalf of 19 non-governmental organizations). The New York Times A11 (New York, 11 October 1999).
2. The Crucible II Group. Seeding Solutions Volume 1. Policy options for genetic resources (People, Plants, and Patents revisited) (International Plant Genetic Resources Institute (IPGRI) and Dag Hammarskjöld Foundation (DHF), Rome & Upsala, 2000 ).
3. Darwin, C. The Origin of Species (Penguin Books USA Inc., New York, 1958).
4. Darwin, C. The Effects of Cross and Self Fertilization in the Vegetable Kingdom (New York Univ. Press, New York, 1989).
5. Crabb, R. The Hybrid Corn-Makers (West Chicago Publishing Company, West Chicago, Illinois, 1993).