The Encyclopedia Americana : volume 1
Americana Corporation, 1964
Buku Referensi
Collier's encyclopedia : volume 1
Macmillan Educational Company, 1990
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Encyclopedia of knowledge : volume 1
Grolier Incorporated, 1991
Buku Referensi
The World book encyclopedia : volume 1, A
Field Enterprises Educational Corporation, 1963
Buku Referensi
The New Encyclopedia Britannica : volume 1
Encyclopedia Britannica, 1983
Buku Referensi