Stocholm, 1958
Buku Teks
Hubbard, G. E., author
International Secretariat Institute of Pasific Relations , 1943
Buku Teks
Linebarger, Paul Myron Anthony, 1913-1966, author
York D van Nostrand, 1954
Buku Teks
Millard, Thomas F., author
Fisher Unwin, 1908
Buku Teks
Bisson, T.A., author
Macmilan Co., 1945
Buku Teks