Frankel, Susan J., Janice Alexander, Diana Benner, Janell Hillman, and Alisa Shor. “Phytophthora Pathogens Threaten Rare Habitats and Conservation Plantings”. Sibbaldia: the International Journal of Botanic Garden Horticulture, no. 18 (February 21, 2020): 53–65. Accessed April 4, 2025. https://journals.rbge.org.uk/rbgesib/article/view/288.