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