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