de Keyzer, Charlotte W, Sheila R Colla, Clement F Kent, Nicole E Rafferty, Leif L Richardson, and James D Thomson. “Delving Deeper: Questioning the Decline of Long-Tongued Bumble Bees, Long-Tubed Flowers and Their Mutualisms With Climate Change”. Journal of Pollination Ecology 18 (July 7, 2016): 36–42. Accessed December 10, 2024. https://www.pollinationecology.org/index.php/jpe/article/view/396.