Thatcher, G.W.
Frederick Ungar, [Date of publication not identified]
Buku Teks
Yeon, Jaehoon
Routledge, 2011
Buku Teks
Donaldson, Bruce
Routledge, 1997
Buku Teks
Herrity, Peter
Routledge, 2000
Buku Teks
Wehr, Hans, 1909-1981
Spoken Language Services, 1976
Buku Referensi