Duke University Press,
Majalah, Jurnal, Buletin
Short, Raymond W.
Henry Holt and Company, 1954
Buku Teks
Wachner, Clarence W.
Macmillan, 1963
Buku Teks
Compiled and edited by Dorothy Nyren Curley, Maurice Kramer, Elaine Fialka Kramer
Continuum, 1989
Buku Referensi
Watt, Homer A.
Scott, Foresman, 1932
Buku Teks