Kaszynski, William. The American Highway: The History and Culture of Roads in the United States. Jefferson, N.C.: McFarland, 2000. Page 9 (页面存档备份,存于互联网档案馆)
Bailey, L. H., and Wilhelm Miller. Cyclopedia of American Horticulture, Comprising Suggestions for Cultivation of Horticultural Plants, Descriptions of the Species of Fruits, Vegetables, Flowers, and Ornamental Plants Sold in the United States and Canada, Together with Geographical and Biographical Sketches. New York [etc.]: The Macmillan Co, 1900. Page 320 (页面存档备份,存于互联网档案馆).
Gabriel, Richard A. The Great Armies of Antiquity. Westport, Conn: Praeger, 2002. Page 9 (页面存档备份,存于互联网档案馆).
Kaszynski, William. The American Highway: The History and Culture of Roads in the United States. Jefferson, N.C.: McFarland, 2000. Page 9 (页面存档备份,存于互联网档案馆)
Bailey, L. H., and Wilhelm Miller. Cyclopedia of American Horticulture, Comprising Suggestions for Cultivation of Horticultural Plants, Descriptions of the Species of Fruits, Vegetables, Flowers, and Ornamental Plants Sold in the United States and Canada, Together with Geographical and Biographical Sketches. New York [etc.]: The Macmillan Co, 1900. Page 320 (页面存档备份,存于互联网档案馆).
Gabriel, Richard A. The Great Armies of Antiquity. Westport, Conn: Praeger, 2002. Page 9 (页面存档备份,存于互联网档案馆).