The New Encyclopaedia Britannica : volume 4
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 4
Americana Corporation, 1960
 Buku Referensi
The World book encyclopedia : volume 4, D
Field Enterprises Educational Corporation, 1963
 Buku Referensi
Collier's encyclopedia, with bibliography and index : volume 4
P.F. Collier & Son, 1954
 Buku Referensi
Compton's pictured encyclopedia and fact index : volume 4
F.E. Compton & Company, 1963
 Buku Referensi
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