The World book encyclopedia : volume 15, Q-R
Field Enterprises Educational Corporation, 1963
 Buku Referensi
The World book encyclopedia : volume 18, U-V
Field Enterprises Educational Corporation, 1963
 Buku Referensi
The World book encyclopedia : volume 19, W-X-Y-Z
Field Enterprises Educational Corporation, 1963
 Buku Referensi
The World book encyclopedia : volume 20, reading and study guide
Field Enterprises Educational Corporation, 1963
 Buku Referensi
The Encyclopedia Americana : volume 12
Americana Corporation, 1977
 Buku Referensi
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