The Encyclopedia Americana : volume 30
Americana Corporation, 1977
Buku Referensi
The Encyclopedia Americana : volume 30
Americana Corporation, 1964
Buku Referensi
The Encyclopedia Americana : the international reference work, volume 30
Americana Corporation, 1960
Buku Referensi
The encyclopedia American
Americana Corporation, 1980
Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
Buku Referensi