Krooss, Herman Edward, 1912-1975
American business history
Prentice-Hall, 1972
 Buku Teks
Business History Review
Harvard Business School, 2009
 Majalah, Jurnal, Buletin
Sharma, R.C.
Business correspondence and report writing: a practical approach to business & technical communication
Tata McGraw-Hill, 2002
 Buku Teks
Morrisey, George L.
Effective business and technical presentations / George L. Morrisey, Thomas L. Sechrest
Addison-Wesley, 1987
 Buku Teks
Cochran, Thomas C.
Business in american life : a history / Thomas C. Cochran
McGraw-Hill, 1972
 Buku Teks SO