Morgan, J. Brian, 1935-, author
Avebury, 1996
Buku Teks
Bevan, Vaughan
Butterworth, 1991
Buku Teks
Shah, Giriraj, author
Anmol Publications PVT. Ltd., 1999
Buku Referensi
Dutelle, Aric W. , author
Jones and Bartlett Publishers, 2011
Buku Teks
Smart, Huw, author
Oxford University Press, 2006
Buku Referensi