Borcherding, Fr. 1889. Dritter Nachtrag zur Mollusken-Fauna der nordwestdeutschen Tiefebene. Abh. Naturw. Ver. Bremen 10: 335-367. Available electronically.
Borcherding, 1889. Abh. Naturw. Ver. Bremen 10: 345, pl. 5, fig. 4.
Borcherding, 1889. Abh. Naturw. Ver. Bremen 10: 342, pl. 4, figs. 3-3b.
(homonym of Unio macrorhynchus Bourguignat in Locard, 1882; renamed Unio borcherdingi Bourguignat in Locard, 1889)
Borcherding, 1889. Abh. Naturw. Ver. Bremen 10: 348, pl. 5, fig. 8.
Borcherding, 1889. Abh. Naturw. Ver. Bremen 10: 348, pl. 5, fig. 5.