Dufief, N. G. 1., Torres, M., Hargous, L., & Cadena, M. V. d. l. (1825). Dufief's Nature dispayed in her mode of teaching language to man: Being A new and infallible method of acquiring a languages. Adapted to the Spanish. New York: Printed for, and sold by the author.

Dufief, N. G. 1776?-1834., Manuel Torres, L. Hargous, and Mariano Velaquez de la Cadena. Dufief's Nature Dispayed in Her Mode of Teaching Language to Man: Being A New and Infallible Method of Acquiring a Languages. Adapted to the Spanish. New York: Printed for, and sold by the author, 1825.

Dufief, N. G. 1776?-1834., Manuel Torres, L. Hargous, and Mariano Velaquez de la Cadena. Dufief's Nature Dispayed in Her Mode of Teaching Language to Man: Being A New and Infallible Method of Acquiring a Languages. Adapted to the Spanish. New York: Printed for, and sold by the author, 1825.