Hunston, Susan
Cambridge University Press,, 2006
Buku Teks
Li Wei
John Wiley & Sons Ltd, 2014
Buku Teks
Oxford University Press, 1995
Majalah, Jurnal, Buletin
Lado, Robert
University of Michigan, 1957
Buku Teks
J. P. B. Allen and S. Pit Corder edited by
Oxford University, 1980
Buku Teks