Langhans, Edward A.
Southern Illinois University Press, 1981
Buku Teks
Everyman's Library , 1964
Buku Teks
Tremain, Rose, author
Hamish Hamilton, 1989
Buku Teks
Artikel Jurnal
edited by Steve M. Davis and John C. Ogden
St. Lucie Press, 1994
Buku Teks