Leuba, Walter
Twayne, 1867
Buku Teks
edited by Walter Z. Laqueur & George L. Mosse
Harper , 1967
Buku Teks
[publisher not identified], [date of publication not identified]
Buku Referensi
Speaight, R., author
Arthur Barker, 1954
Buku Teks
Salomon, Pierre, author
Paris Hatier-Boivin 1953
Buku Teks