Verhaar, J.W.M., author
Gadjah Mada University Press, 1990, c. 1982
Buku Teks
Post-Graduate Centre, 1975
Buku Teks
Radopi, 1980
Buku Teks
Crystal, David, 1941-, author
Cambridge University Press, 1991
Buku Referensi
Crystal, David, 1941-, author
Cambridge University Press, 1997
Buku Referensi