Brock, Dee, author
John Wiley & Sons, 1978
Buku Teks
Dick, Jill, author
A and C Black, 1994
Buku Teks
Harris, Roy, author
Routledge, 1995
Buku Teks
O`Shea, Robert P. (Robert Paul), 1953-, author
Harcourt , 2000
Buku Teks
Rosenwasser, David, author
Harcourt Brace & Company, 1997
Buku Teks