World Facts : countries of the world
Gedes & Grosset, 2001
 Buku Referensi
Foy, Nancy
The IBM world
Eyre Methuen, 1974
 Buku Teks SO
The World's religions
by Stewart Sutherland ... [and others]
Routledge, 1988
 Buku Teks SO
Forrester, Jay Wright
World dynamics
Wright-Allen Press, 1973
 Buku Teks SO
Ferris, Brian
World problems
Hulton Educational Publications, 1973
 Buku Teks SO