Schmidt, R.E. & Daniels, R.A. (2006)

Hybridization in Umbridae in the Hudson River, New York, with Designation of Neotypes for Umbra limi and Umbra pygmaea

. Zootaxa, 1113 (1), 1–20.
https://doi.org/10.11646/zootaxa.1113.1.1