Everyman's encyclopaedia : volume twelve
edited by E. F. Bozman
J. M. Dent & Sons, 1958
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Encyclopaedia Britannica : volume 1
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
Encyclopaedia Britannica : volume 2
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
Encyclopaedia Britannica : volume 3
Encyclopaedia Britannica Inc., 1967
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Encyclopaedia Britannica : volume 4
Encyclopaedia Britannica Inc., 1967
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