Gerstenberg, Charles W., author
Prentice-Hall, 1951
Buku Teks
Gerstenberg, Charles W., author
Prentice-Hall, 1956
Buku Teks
Scott, Mark C., author
John Wiley & Sons, 2005
Buku Teks
Owens, Richard Norman
Prentice-Hall, 1951
Buku Teks
Modern Business Report , 1985
Buku Teks