Hoffmann, F. L. (1912). Rural health and welfare with special reference to New England, New York, New Jersey and Pennsylvania: By Frederick L. Hoffman. American land and irrigation exposition, New York City, November 15 to 30, 1912. s.t.
Chicago-Zitierstil (17. Ausg.)Hoffmann, Frederick L. Rural Health and Welfare with Special Reference to New England, New York, New Jersey and Pennsylvania: By Frederick L. Hoffman. American Land and Irrigation Exposition, New York City, November 15 to 30, 1912. Newark, New Jersey: s.t, 1912.
MLA-Zitierstil (9. Ausg.)Hoffmann, Frederick L. Rural Health and Welfare with Special Reference to New England, New York, New Jersey and Pennsylvania: By Frederick L. Hoffman. American Land and Irrigation Exposition, New York City, November 15 to 30, 1912. s.t, 1912.