Hamilton, Robert W., author
West Publishing, 1992
Buku Teks
Babb, Hugh W., author
Foundation Press , 1959
Buku Teks
Stockwell, Nigel, author
Pitman, 1992
Buku Teks
Penner, J. E. (James E.), author
Oxford University Press, 2016
Buku Teks
Hudson, Alastair, author
Cavendish Publishing Limited, 2003
Buku Teks