Edited by William James
Anmol Publications PVT. LTD., 2005
Buku Teks
Humprey, Nicholas
New York Springer-Verlag , 1999
Buku Teks
Colbert, Edwin H.
John Wiley & Sons, 1980
Buku Teks
Saigon : Review Horizons, t.th.
Buku Teks
Chesterman, Simon
Cambridge University Press, 2015
Buku Teks