Stevenson, Nicholas, author
Longman, 1999
Buku Teks
Donaldson, Thomas
Prentice-Hall, 1981
Buku Teks
Baillie, James, author
Routledge, 2000
Buku Teks
Fuller, Lon L., author
Yale University Press, 1974
Buku Teks
Fuller, Lon L., author
Yale University Press, 1964
Buku Teks