The Encyclopedia Americana : the international reference work, volume 3
Americana Corporation, 1960
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 4
Americana Corporation, 1960
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 7
Americana Corporation, 1960
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 9
Americana Corporation, 1960
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 10
Americana Corporation, 1960
 Buku Referensi