Virtue's wonder world of knowledge : volume 1
Virtue & Company Limited, 1981
Buku Referensi
The New Encyclopaedia Britannica : volume 1
Encyclopaedia Britannica Inc., 2003
Buku Referensi
The New Encyclopaedia Britannica : volume 1
Encyclopaedia Britannica Inc., 1983
Buku Referensi
The New Encyclopaedia Britannica : volume 1
Encyclopaedia Britannica Inc., 1978
Buku Referensi
The New Encyclopedia Britannica : volume 1
Encyclopedia Britannica, 1983
Buku Referensi
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