Leech, Geoffrey N., 1936-, author
Edinburgh University Press, 2006
Buku Referensi
Makkink, H.J., author
Nijgh and Van Ditmar, 1951
Buku Teks
Socin, A
G.E. Stechert, 1942
Buku Teks
Newby, Michael, author
Cambridge University Press, 1988
Buku Teks
Woods, Geraldine, author
John Wiley & Sons, 2015
Buku Teks