Willingham, W. F. (1983). Army engineers and the development of Oregon: A history of the Portland District, U.S. Army Corps of Engineers. U.S. Army Corps of Engineers.
Style de citation Chicago (17e éd.)Willingham, William F. Army Engineers and the Development of Oregon: A History of the Portland District, U.S. Army Corps of Engineers. [Washington, D.C.?: U.S. Army Corps of Engineers, 1983.
Style de citation MLA (8e éd.)Willingham, William F. Army Engineers and the Development of Oregon: A History of the Portland District, U.S. Army Corps of Engineers. U.S. Army Corps of Engineers, 1983.
Attention : ces citations peuvent ne pas être correctes à 100%.