Sheffield, Cory Silas. “Pollination, Seed Set and Fruit Quality in Apple: Studies With Osmia Lignaria (Hymenoptera: Megachilidae) in the Annapolis Valley, Nova Scotia, Canada”. Journal of Pollination Ecology 12 (February 28, 2014): 120–128. Accessed April 26, 2024. https://pollinationecology.org/index.php/jpe/article/view/229.