Steiner, Hugo, author
Opus Publication, 2007
Buku Referensi
Russell, Doug, author
Amacom, 2011
Buku Teks
Epton, Nina
Oldbourne Press, [1956]
Buku Teks
Burger, Chester, author
Macmillan, 1964
Buku Teks
Bushnell, Candace, author
Hyperion Books, 2005
Buku Teks