Noble, David W
University of minnesota press, 2002
Buku Teks
Stafford, John, author
University of California Press, 1952
Koleksi Publik
Ver Steeg, Clarence L., author
Harper and Row, 1981
Buku Teks
by Mary Beth Norton. .. [et.al.]
Houghton-Miffiln, 1988
Buku Teks
Todd, Lewis Paul, author
Harcourt, Brace & World, 1961
Buku Teks