Morgan, John, 1944-2004, author
Oxford University Press, 1990
Buku Teks
Hunter, Lynne, author
Prentice Hall Regents, 1989
Buku Teks
Hill, L.A.
Oxford University Press, 1982
Buku Teks
Hill, LA
Oxford University press, 1982
Buku Teks
Lugton, Robert C.
Prentice-Hall, 1978
Buku Teks