Woolf, Emile, author
Prentice-Hall, 1994
Buku Teks
McCune, George M., author
Harvard University Press, 1950
Buku Teks
Oliver, Gordon, author
Prentice-Hall, 1980
Buku Teks
Wilmot, Chester, author
ST. James`s Place, 1952
Buku Teks
Mitchell, Allan, author
Prentice-Hall, 1981
Buku Teks