Gregory, J. N., author
The world of radioisotopes
Angus & Robertson , 1966
 Buku Teks
Johnson, George B., author
The Living world
McGraw-Hill, 2003
 Buku Teks
Toynbee, Arnold J., author
The world and the west
Oxford University Press, 1957
 Buku Teks
Rosenberg, Donna
World mythodology
 Buku Teks
Ople, Blas F. author
Citizen of the world
Institute for Public Policy, 2001
 Buku Teks
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