The New Encyclopaedia Britannica : volume 15
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
Ensiklopedi nasional Indonesia; Jilid 15
Cipta Adi Pustaka, 1990
 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
Collier's encyclopedia, with bibliography and index : volume 15
P.F. Collier & Son, 1954
 Buku Referensi
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