Infections of the Nervous System, (Bacterial, Fungal, Spirochetal, Parasitic) and Sarcoidosis, NeurosyphilisAdams & Victors Principles of Neurology, Chp 32, pg 723, Ropper, A.H.,et al, 2014
NeurosyphilisArch Neurol 42:606-613, Simon,R.P., 1985