The New Encyclopaedia Britannica : volume 29
Encyclopaedia Britannica Inc., 2003
Buku Referensi
The New Encyclopaedia Britannica : volume 29
Encyclopaedia Britannica Inc., 1988
Buku Referensi
The New Encyclopaedia Britannica : volume 29, micropaedia konowledge in depth
Encyclopaedia Britannica Inc., 2002
Buku Referensi
The New encyclopaedia Britannica : volume 29, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
Buku Referensi
The Encyclopedia Americana : volume 29
Americana Corporation, 1977
Buku Referensi