Felker, P., & Bunch, R. (2020). The importance of native bees, especially cactus bees (Diadasia spp) in the pollination of cactus pears. Journal of the Professional Association for Cactus Development, 18, 15–24. https://doi.org/10.56890/jpacd.v18i.49 (Original work published August 13, 2016)