Johnson, R.I. 1971. The types and figured specimens of Unionacea (Mollusca: Bivalvia) in the British Museum (Natural History). Bulletin of the British Museum (Natural History) 20(3): 75-108. Available electronically.
‘“Ihering” Simpson’ R.I. Johnson, 1971. Bull. BMNH 20(3): 85.
(error for Unio guahybae Simpson, 1900)