Cambridge University Press, 2006
eBooks
Hays, David G.
American Elsevier puvlishing, 1967
Buku Teks
edited by Istvan Batori, Winfried Lenders, Wolfgang Putschke
Walter de Gruyter, 1989
Buku Referensi
McEnery, Tony, 1964-, author
Routledge, 2010
Buku Teks
Gazdar, Gerald, author
Addison-Wesley, 1989
Buku Teks