Tebbel, John William
Otterbein Press, 1963
Buku Teks
Correa, Charles, author
Thames & Hudson, 1996
Buku Teks
Mee, Jon, author
Cambridge University Press , 2010
Buku Teks
Patten, Robert L., author
Cambridge University Press, 2012
Buku Teks
Blair, Charles F.
Random House , 1969
Buku Teks