Foreword by Wong Lian Aik
Center for English Language Communication. NUS, 2001
Buku Teks SO
Jesus Romero-Trillo, editor
Springer, 2012
eBooks
edited by James Flood, Julie M. Jensen, Diane Lapp, James R. Squire
Macmillan, 1991
Buku Referensi
Springer, 2016
Buku Teks
Mann, Steve, 1960-
Routledge, 2017
Buku Teks