Willis, S. J., Valentine, D. T. 1., & Hufeland, O. (1900). Historical index to the Manuals of the corporation of the city of New York: ("Valentine's manuals") 1841 to 1870, consisting of two thousand three hundred and twenty-five references. New York: F.P. Harper.

Willis, Samuel J., D. T. 1801-1869 Valentine, and Otto Hufeland. Historical Index to the Manuals of the Corporation of the City of New York: ("Valentine's Manuals") 1841 to 1870, Consisting of Two Thousand Three Hundred and Twenty-five References. New York: F.P. Harper, 1900.

Willis, Samuel J., D. T. 1801-1869 Valentine, and Otto Hufeland. Historical Index to the Manuals of the Corporation of the City of New York: ("Valentine's Manuals") 1841 to 1870, Consisting of Two Thousand Three Hundred and Twenty-five References. New York: F.P. Harper, 1900.