Robbins, Robert R., author
John Wiley & Sons, 1981
Buku Teks
Glahe, Fred R.
San Diego Harcourt Brace Jovanovich, Inc.,
Buku Teks
Metcalf, Richard W., author
Harcourt Brace Jovanovich, 1990
Buku Teks
Grove, Susan K., author
W.B. Saunders, 1993
Buku Teks
Lucas, Henry C., author
McGraw-Hill, 1981
Buku Teks