Hubbard, G.E.
International Secretariat Institute of Pasific Relations, 1943
Buku Teks
Linebarger, Paul Myron Anthony, 1913-1966
York D van Nostrand, 1954
Buku Teks
Stocholm, 1958
Buku Teks
Bisson, T.A.
Macmillan, 1945
Buku Teks
Bisson, T.A.
International Secretariat Institute of Pasific Realtions , 1945
Buku Teks