Gower, L.C.B.
Stevens and Sons, 1969
Buku Teks
Ivamy, E.R. Hardy, author
Butterworth, 1978
Buku Teks
Mayson, Stephen W.
Blackstone Press Limited, 1989
Buku Teks
Rose, Francis, author
Sweet & Maxwell, 1989
Buku Teks
Topham, Alfred F.
Stevens and Sons, Limited, 1933
Buku Teks