Compton's pictured encyclopedia and fact-index : volume 12
F.E. Compton & Company, 1963
Buku Referensi
The New Encyclopedia Britannica : volume 2
Encyclopedia Britannica, 1983
Buku Referensi
The New Encyclopedia Britannica : volume 3
Encyclopedia Britannica, 1983
Buku Referensi
The New Encyclopedia Britannica : volume 4
Encyclopedia Britannica, 1983
Buku Referensi
The New Encyclopedia Britannica : volume 5
Encyclopedia Britannica, 1983
Buku Referensi
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