Wales, H.G. Quaritch
Quaritch, 1967
Buku Teks
Puvier, Jan M.
New York : E.J. Brill, 1995,
Buku Referensi
Spencer, J.E., author
John Wiley & Sons, 1954
Buku Teks
Vasilyev, D., author
Foreign Languages Publishing House, 1959
Buku Teks
Lyon, Peter, author
Oxford University Press, 1969
Buku Teks