Meyer, Robert R.
George Borrow / Robert R. Meyers
Twayne's, 1966
 Buku Teks SO
Musolf, Lloyd D.
Government and the economy : promoting the general welfare / Lloyd D. musolf, George McGovern
Scott, Foresman and Company, 1965
 Buku Teks
Toynbee, Arnold J.
East to west
Oxford University Press, 1958
 Buku Teks
East and West
Roma : Istituto Iataliano per IlMedio ed Estremo Oriente
 Majalah, Jurnal, Buletin
Guenon, Rene
East and West
Luzac, 1941
 Buku Teks SO