Cita APA

True, A. C. (1928). A history of agricultural extension work in the United States, 1785-1923. U.S. G.P.O..

Citación estilo Chicago

True, Alfred Charles. A History of Agricultural Extension Work in the United States, 1785-1923. Washington, D.C.: U.S. G.P.O., 1928.

Cita MLA

True, Alfred Charles. A History of Agricultural Extension Work in the United States, 1785-1923. U.S. G.P.O., 1928.