The Encyclopedia Americana : volume 21
Americana Corporation, 1977
Buku Referensi
The Encyclopedia Americana : volume 21
Americana Corporation, 1964
Buku Referensi
Encyclopaedia Britannica : volume 21
Encyclopaedia Britannica Inc., 1967
Buku Referensi
Encyclopaedia Britannica : volume 21
Encyclopaedia Britannica Inc., 1968
Buku Referensi
Encyclopaedia Britannica : volume 21
Encyclopaedia Britannica Inc., 1960
Buku Referensi
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