Duke University Press,
Majalah, Jurnal, Buletin
Short, Raymond W.
Henry Holt and Company, 1954
Buku Teks
Wachner, Clarence W.
Macmillan, 1963
Buku Teks
Kirby, David K.
Gale Research, 1975
Buku Referensi
Compiled and edited by Dorothy Nyren Curley, Maurice Kramer, Elaine Fialka Kramer
Continuum, 1989
Buku Referensi