Gallinger, George W., author
Prentice-Hall, 1995
Buku Teks
Lerner, Eugene M., author
Harcourt Brace Jovanovich , 1971
Buku Teks
Joy, O. Maurice
Richard D. Irwin. Inc., 1980
Buku Teks
Brigham, Eugene F., 1930-, author
The Dryden Press, 1996
Buku Teks
Brigham, Eugene F., 1930-, author
The Dryden Press, 1990
Buku Teks