The New Encyclopedia Britannica : volume 15
Encyclopedia Britannica, 1983
 Buku Referensi
Grolier family encyclopedia : volume 15
Grolier Incorporated, 1995
 Buku Referensi
The World book encyclopedia : volume 15
World Book, 1983
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 15
Americana Corporation, 1960
 Buku Referensi
The World book encyclopedia : volume 15, Q-R
Field Enterprises Educational Corporation, 1963
 Buku Referensi
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