Hastings, Walker & Galland (2014). ”Torpediniformes”. Fishes: A Guide to Their Diversity. University of California Press. sid. 41. ISBN 9780520278721
Ebert & Dando (2020). ”Electric rays”. Field Guide to Sharks, Rays & Chimaeras of Europe and the Mediterranean. Princeton University Press. sid. 166. ISBN 9780691211824