Centaurea cyanus - Plant Finder, Missouri Botanical Garden, https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=277177, accessed November 10, 2024
Centaurea cyanus (Bachelor's Button, Bachelors Buttons, Bluebottle, Cornflower) | North Carolina Extension Gardener Plant Toolbox, NC State Extension, https://plants.ces.ncsu.edu/plants/centaurea-cyanus/, accessed November 10, 2024
Centaurea cyanus (Cornflower), Gardenia, https://www.gardenia.net/plant/centaurea-cyanus-cornflower, accessed November 10, 2024
Cornflower | Description & Facts | Britannica, Britannica, https://www.britannica.com/plant/bachelors-button, accessed November 10, 2024
Centaurea cyanus (Cornflower): Minnesota Wildflowers, Minnesota Wildflowers, https://www.minnesotawildflowers.info/flower/cornflower, accessed November 10, 2024
Centaurea cyanus Cornflower, Garden cornflower, Blue Bottle, Cornflower PFAF Plant Database, Plants for a Future, https://pfaf.org/user/Plant.aspx?LatinName=Centaurea+cyanus, accessed November 10, 2024
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024