Grolier academic encyclopedia 11
London: Grolier International, 1991,
 Buku Referensi
Grolier academic encyclopedia 12
London: Grolier International, 1991,
 Buku Referensi
Grolier academic encyclopedia 13
London: Grolier International, 1991,
 Buku Referensi
Grolier academic encyclopedia 18
London: Grolier International, 1991,
 Buku Referensi
Grolier academic encyclopedia 19
London: Grolier International, 1991,
 Buku Referensi
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