Graaff, Nell van de, author
University of Queensland press , 1989
Buku Teks
Bell, Mary Hayley, author
J.B. Lippincott, 1968
Buku Teks
Fleming, Thomas J.
St. Martin's Press, 1960
Buku Teks
The United Stated Capital Historical Society,, 1964
Buku Teks SO
Hall, Rodney, author
McPhee Gribble , 1988
Buku Teks