The World book encyclopedia : volume 15
World Book, 1983
Buku Referensi
The New Encyclopaedia Britannica : volume 15
Encyclopaedia Britannica Inc., 1988
Buku Referensi
The New Encyclopaedia Britannica : volume 15
Encyclopaedia Britannica Inc., 2003
Buku Referensi
The New Encyclopaedia Britannica : volume 15
Encyclopaedia Britannica Inc., 1978
Buku Referensi
The New Encyclopedia Britannica : volume 15
Encyclopedia Britannica, 1983
Buku Referensi