Longman, 1987
Buku Referensi
edited by Marcelo Dascal, Dietfried Gerhardus, Kuno Lorenz and Georg Meggle
Walter de Gruyter, 1992
Buku Referensi
edited by Marcelo Dascal, Dietfired Gerhardus, Kuno Lorenz and Georg Meggle
Walter de Gruyter, 1996
Buku Referensi
Gonzalez, Andrew B., author
Oxford University Press, 1984
Buku Teks
Raymond Hickey, editor
Wiley-Blackwell, 2010
Buku Teks