Warren, Paul, 1958-, author
[Cambridge University Press, ], 2013
eBooks
Steinberg, Danny D., author
Longman, 1982
Buku Teks
Berlin : Mouton Publishers
Majalah, Jurnal, Buletin
Field, John, author
Routledge, 2006
Buku Teks
Slama-Cazacu, Tatiana
The Hague Mouton, 1973
Buku Teks