A popular essay on subjects of penal law and on uninterrupted solitary confinement at labor as contradistinguished to solitary confinement at night and joint labor by day, in a letter to John Bacon - Lieber, Francis 1800-1872 ([Philadelphia Society for Alleviating the Miseries of Public Prisons], 1838)
OCLC, 20900110. - Reproduction of original from Harvard Law School Library