Coad, Jane, author
Elsevier , 2005
Buku Teks
edited by Susan E. Montague, Roger Watson, Rosamund A. Herbert
Elsevier , 2005
Buku Teks
Prentice-Hall, 2001
Buku Teks
Waugh, Anne, author
Churchill Livingstone , 2006
Buku Teks
Tortora, Gerard J., author
Purdue University, 1998
Buku Teks