Johnson, R.I. 1969. The Unionacea of William Irvin Utterback. Nautilus 82(4): 132-135. https://www.biodiversitylibrary.org/page/8517191.
(error for Quadrula quadrula contraryensis Utterback, 1915)
‘Utterback’ R.I. Johnson, 1969. Nautilus 82(4): 132.