A History of the World
 Buku Teks
Frankel, Ernst Gabriel
The world shipping industry
Croom Helm, 1987
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Palmer, Robert Roswell, 1909-2002
A history of the modern world
McGraw-Hill, 1950
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Palmer, Robert Roswell, 1909-2002
A history of the modern world
Alfred A. Knopf, 1967
 Buku Teks
Palmer, Robert Roswell, 1909-2002
A history of the modern world
Alfred A. Knopf, 1983
 Buku Teks