Murray, Rebecca, author
Sweet & Maxwell , 2012
Buku Teks
Wood, Harley
Angus and Robertson, 1967
Buku Teks
Beattie, John, author
Free Press of Glencoe, 1966
Buku Teks
Fischer, Fritz, author
W.W. Norton & Company, 1967
Buku Teks
Phelan, John Leddy, author
University of Wisconsin Press, 1959
Buku Teks