Kania, Richard R. E., author
Elsevier , 2012
Buku Teks
Barry, Brian, author
Clarendon, 1973
Buku Teks
Gordon, Gary R. , author
Elsevier, 2012
Buku Teks
Marshall, H.H.
Sweet & Maxwell Limited, 1959
Buku Teks
Nathan, N.M.L.
Macmillan Press , 1971
Buku Teks