Hohmann, Harald
Martinus Nijhoff, 1994
Buku Teks
Guruswamy, Lakshman D.
Thomson/West, 2012
Buku Teks
Bhatt, S
A.P.H. Publishing, 2013
Buku Teks
edited by W. Lang, H. Neuhold,K. Zemanek
Graham & Trotman / Martinus Nijhoff, 1995
Buku Referensi
Crowe, Jonathan
Edward Elgar, 2013
Buku Teks