Hally, M. Bernard Dette
Elsevier, 2009
Buku Teks
Spate, Oskar Hermann Kristian, author
Oxford University Press, 1965
Buku Teks
Oxford University Press, 1994
Buku Teks
Norton, Frank
Angus and Robertson, 1953
Buku Teks
Sutton, K.C.T., author
Law Book, 1974
Buku Teks