Kempin, Frederick G
West Publishing Co, 1973
Buku Teks
Hoover, Herbert, 1874-1964, author
William Monrow, 1962
Buku Teks
Harlow, Ralph Volney, author
Holt, Rinehart and Winston,Inc, 1964
Buku Teks
McGuire, Edna
Macmillan, 1954
Buku Teks
Dawson, George Glenn
Collier Books, 1963
Buku Teks