Michael, author
Chronicle Books, 2000
Buku Referensi
Whelan, Bride M., author
Rockport Publisher, 1994
Buku Teks
Whelan, Bride M., author
Rockport Publisher, 2005
Buku Teks SO
Engdahl, David A., author
Chilton Books, 1967
Buku Teks
Sawahata, Lesa, author
Rockport, 2001
Buku Teks