Langeland, K., & Enloe, S. (2017). Natural Area Weeds: Distinguishing Native and Non-Native "Boston Ferns" and "Sword Ferns" (Nephrolepis spp.): SSAGR22/AG120, 12/2017. EDIS, 2017(6). https://doi.org/10.32473/edis-ag120-2001 (Original work published August 8, 2001)