Urvoy, Y.
Paris Librairie Larose 1949
Buku Teks
Pauphilet, M Albert
Paris Delalain 1937
Buku Teks
Bruhat, Jean.
Presses Universitaires de France,, 1968
Buku Teks
Bonjour, Edgar, author
Helbing & Lichtenhahn, 1970
Buku Referensi
Grousset, R.
Paris Geuthner 1929
Buku Teks