Ollerton, Jeff, James R. Rouquette, and Tom D. Breeze. “Insect Pollinators Boost the Market Price of Culturally Important Crops: Holly, Mistletoe and the Spirit of Christmas”. Journal of Pollination Ecology 19 (December 12, 2016): 93–97. Accessed April 19, 2024. https://pollinationecology.org/index.php/jpe/article/view/412.