Katz, Emma J, and Carla J Essenberg. “The Effect of the Dispersion of Rewarding and Rewardless Flowers on Visitation and Constancy by Bumblebees (Bombus Impatiens)”. Journal of Pollination Ecology 23 (August 8, 2018): 119–126. Accessed April 17, 2024. https://pollinationecology.org/index.php/jpe/article/view/452.