Willoughby, W. F. (1977). Territories and dependencies of the United States, their Government and administration [microform]. University of the Philippines Library.
Lua i Stíl Chicago (17ú heag.)Willoughby, William Franklin. Territories and Dependencies of the United States, Their Government and Administration [microform]. Quezon City: University of the Philippines Library, 1977.
Lua MLA (9ú heag.)Willoughby, William Franklin. Territories and Dependencies of the United States, Their Government and Administration [microform]. University of the Philippines Library, 1977.
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