Macmillan encyclopedia of sciences : Body and health
New York : Macmillan Library reference USA, 1997,
 Buku Referensi
Macmillan encyclopedia of sciences : Fuel and power
New York : Macmillan Library Reference, 1997,
 Buku Referensi
Rourke's world of science encyclopedia vol. 4 : earth science
Rourke Publishing LLC, 2009
 Buku Referensi
Rourke's world of science encyclopedia vol. 9 : technology
Rourke Publishing LLC, 2009
 Buku Referensi
Rourke's world of science encyclopedia vol. 8 : mathematics
Rourke Publishing LLC, 2009
 Buku Referensi
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