Cunningham, James P.
Kogan Page, 1973
Buku Teks
edited by D. J. Gijlstra and D. F. Murphy
Kluwer, 1984
Buku Teks
Arnull, Anthony
Leicester University Press, 1990
Buku Teks
Willy Ilham Dasrul, examiner
Kluwer Harrap Handbooks, 1973
Buku Teks
Goyder, Joanna
Oxford Univesity Press, 2009
Buku Teks