https://dnr.wi.gov/topic/WildlifeHabitat/herps.asp?mode=table&group=Frogs
https://bogfriends.org/wp-content/uploads/2019/06/Cedarburg_Bog_Frogs_List.pdf
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0021191
https://cmschalk.weebly.com/ – Based in Texas but some useful information