Range map of Northern leopard frog
Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. 2016. Robert Powell, Roger Conant, Joseph T. Collins. Houghton Mifflin Harcourt, ISBN 9780544129979
Environment and Climate Change Canada, Northern leopard frog (Lithobates pipiens): COSEWIC assessment and status report 2009. https://www.canada.ca/en/environment-climate-change/services/species-risk-public-registry/cosewic-assessments-status-reports/northern-leopard-frog-2009.html (retrieved 25 November 2018)
Cephas