Cassedy, JH (1973). "John L. Riddell's Vibrio biceps: Two documents on American microscopy and cholera etiology 1849–59". J Hist Med. 28 (2): 101–108. doi:10.1093/jhmas/xxviii.2.101. PMID4572620.
Cassedy, JH (1973). "John L. Riddell's Vibrio biceps: Two documents on American microscopy and cholera etiology 1849–59". J Hist Med. 28 (2): 101–108. doi:10.1093/jhmas/xxviii.2.101. PMID4572620.