http://www.seedquest.com/resources/history/testimonials/t/TewelesWilliam.htm

http://www.seedquest.com/resources/history/milestones.htm

http://www.limagrain.com/limagrain/history/the-construction-of-an-international-cooperative-group/article-20/gb.html#.VF02T_TF-f8

http://seedstory.wordpress.com/a-brief-history-of-the-seed-industry/

https://intercontinentalcry.org/mayan-peoples-movement-defeats-monsanto-law-guatemala-25564/

Les glaneurs et la glaneuse

https://vimeo.com/37089032