Partlow, Robert B.
Prentice-Hall, 1963
Buku Teks
Knoll, Robert E.
Harcourt, Brace and Company, 1959
Buku Teks
edited by Benjamin B. Hoover, Donald S. Taylor
Holt, 1957
Buku Teks
Blair, Walter
Scott, Foresman and Company, 1949
Buku Teks
Watt, Homer A.
Scott, Foresman, 1932
Buku Teks