Takahashi, Keigo, and Takao Itino. “Comparison of Flower-Visiting Behaviour of Bumblebees and Swallowtail Butterflies to the Japanese Azalea (Rhododendron Japonicum)”. Journal of Pollination Ecology 26 (September 11, 2020). Accessed May 24, 2024. https://pollinationecology.org/index.php/jpe/article/view/595.