Buckman, Robert, author
Pan Book, 1993
Buku Teks
Castleman, Michael, author
Rodale, 2000
Buku Teks SO
Watson, Donald, author
Andre Deutsch, 1995
Buku Referensi
Barasch, Marc Ian
Penguin , 1995
Buku Teks
Pelletier, Kenneth R., author
A Fireside Book, 2002
Buku Teks