rand McNally and Company, 2003
Buku Teks
edited by Bruce Catton
American Heritage, 1958
Buku Teks
Beard, Charles A., author
Macmillan, 1948
Buku Teks
Kemmerer, Donald L., author
Littlefield, Adams, 1956
Buku Teks
Feby Riani, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2003
UI - Skripsi (Membership)