The World book encyclopedia : volume 1, A
Field Enterprises Educational Corporation, 1963
 Buku Referensi
The Cultural library : volume 1, understanding the universe
Parents' Magazine's Cultural Institute, 1965
 Buku Referensi
Grolier family encyclopedia : volume 5
Grolier Incorporated, 1995
 Buku Referensi
The Encyclopedia Americana : volume 2
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 1
Americana Corporation, 1977
 Buku Referensi
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