Encyclopedia of knowledge : volume 20
Grolier Incorporated, 1991
 Buku Referensi
The Encyclopedia Americana : volume 20
Grolier, 1994
 Buku Referensi
The Encyclopedia Americana : volume 20
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 20
Americana Corporation, 1964
 Buku Referensi
Collier's encyclopedia : volume 20
Macmillan Educational Company, 1990
 Buku Referensi
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