Ackley, Gardner, author
Macmillan, 1978
Buku Teks
Branson, William H., author
Harper & Row, 1979
Buku Teks
Boyes, William J., author
South Western Publishing, 1984
Buku Teks
Reynolds, Lloyd G., author
Richard D. Irwin, 1982
Buku Teks
Barnett, Nancy Smith, author
Prentice-Hall, 1972
Buku Teks