Template:Pritchard, 1860
- Pritchard, A. 1860 ['1861']. A history of Infusoria: including the Desmidiaceae and Diatomaceae, British and Foreign. Ed. 4 [enlarged and revised by J.T. Arlidge; W. Archer; J. Ralfs; W.C. Williamson; and the Author]. London: Whittaker & Co. Google Books
- Date of publication: 1–14 December 1860