editor, Suzanne Robitaille Ontiveros
ABC-CLIO, 1986
Buku Referensi
McFarlands & Company, 1983
Buku Referensi
Mitchell, Broadus, author
Oxford University Press, 1964
Buku Teks
Lewis, William Draper, author
Michie, 1937
Buku Teks
Eidelberg, Paul, author
Free Press, 1968
Buku Teks