Brown, Pauline
Pageone, 2002
Buku Referensi
Brown, Pauline
Page One Publishing, 2002
Buku Referensi
Dizard, Wilson, Jr., author
Praeger, 2001
Buku Teks
Mattingly, Garrett, author
Houghton Miffiln, 1955
Buku Teks
Crowther, Geoffrey
Thomas Nelson and Sons Ltd , 1949
Buku Teks