Angladette, Andre
Paris Presses Universitaires de France 1959
Buku Teks
Reitsma, J., author
Ruygrok, [date of publication not identified]
Buku Teks
Dawes, Clinton J.
"New York: John Wiley & Sons, 1981",
Buku Teks
Hautecoeur, L
Paris Laurens 1928
Buku Teks
Calmette, Joseph
Presses Universitaires de France, 1951
Buku Teks