Zumdahl, Steven S.
World of chemistry
Brooks/cole cengage learning, 2013
 Buku Teks
Douglas, Mary, author
The world of goods
Basic Books, 1979
 Buku Teks
Atlas of the world
Rand McNally, editor
Time-Life Books, 1968
 Buku Referensi
State of the world
Lester R. Brown...[et all.]
W.W Norton, 1990/1995
 Buku Teks
WORLD ARCHITECTURE
The Builder Group, {s.a}
 Majalah, Jurnal, Buletin
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