Grime, Robert P., author
Sweet and Maxwell, 1978
Buku Teks
Marsh, S.B., author
MCGraw-Hill, 1995
Buku Teks
Smith, Kenneth, author
Pitman, 1975
Buku Teks
Chorley, Lord, author
Sir Isaac Pitman & Sons, 1960
Buku Teks
Hamblin, Clive, author
Sweet & Maxwell, 1985
Buku Teks