Jesus Romero-Trillo
Springer, 2012
eBooks
Ron White...[et al.]
Cambridge University Press , 1991
Buku Teks SO
Fries, Charles Carpenter
University of Michigan Press, 1951
Buku Teks SO
The Chinese University Press, 1996
Majalah, Jurnal, Buletin
Foreword by Wong Lian Aik
Center for English Language Communication. NUS, 2001
Buku Teks SO