Holden, J. Milnes, author
Pitman, 1971
Buku Teks
Holden, J. Milnes
Pitman, 1993
Buku Teks
Richardson, Linda
John Wiley & Sons, 1981
Buku Teks
Hudson, Alastair, author
Sweet and Maxwell, 2008
Buku Teks
Jarrow, Robert, author
South-Western College, 2000
Buku Teks