Earle, P. (1841). A visit to thirteen asylums for the insane in Europe: To which are added a brief notice of similar institutions in trans-atlantic countries and in the United States, and an essay on the causes, duration, termination and moral treatment of insanity. With copious statistics. Philadelphia: J. Dobson.

Earle, Pliny. A Visit to Thirteen Asylums for the Insane in Europe: To Which Are Added a Brief Notice of Similar Institutions in Trans-atlantic Countries and in the United States, and an Essay On the Causes, Duration, Termination and Moral Treatment of Insanity. With Copious Statistics. Philadelphia: J. Dobson, 1841.

Earle, Pliny. A Visit to Thirteen Asylums for the Insane in Europe: To Which Are Added a Brief Notice of Similar Institutions in Trans-atlantic Countries and in the United States, and an Essay On the Causes, Duration, Termination and Moral Treatment of Insanity. With Copious Statistics. Philadelphia: J. Dobson, 1841.