Leesberg, Arnold C.M.
Late E.J. Brill, 1903
Buku Teks
Routledge, 1998
Buku Teks
Blake, Frank R.
[publisher not identified], 1912
Buku Klasik
Burrow, T., author
Clarendon Press, 1961
Buku Referensi
Meyer-Lubke, W., author
Carl Winter's Universitatsbuchhandlung, 1935
Buku Referensi