Chatterjee, S.K., author
Martinus Nijhoff Publishers, 1981
Buku Teks
Okolie, Charles Chukwuma, author
Frederick A. Praeger, 1975
Buku Teks
Nichilson, Mary Jo
Prentice-Hall, 1997
Buku Teks
Lefever, Katrien
T.M.C. Asser Press, 2012
eBooks
Tebbens, Henricus Duintjer, 1943-, author
Sijthoff & Noordhoff, 1980
Buku Teks