Here are a couple of new factsheets from the Canola Council of Canada and the Canadian Honey Council on the benefits of honey bees to Canola seed production.
http://www.canolacouncil.org/markets-stats/industry-overview/bees-and-canola-a-sweet-relationship/ (general audience)
http://www.canolacouncil.org/crop-production/canola-loves-bees-bees-love-canola/
(producer audience)