The Horn book magazine
The Horn Book, Inc., 1997
 Majalah, Jurnal, Buletin
Fisher, John Crocker
Energy crises in perspective/ John C. Fisher.
John Wiley & Sons, 1974
 Buku Teks SO
Latimer, Paul
Australian business law / by Paul Latimer with CCH editorial staff.
CCH Australia, 1995
 Buku Teks
Rivers, William L.
Editorial
Remaja Rosdokarya, 1994
 Buku Teks SO
Day, Paul W
John Mulgan / Paul W Day
Twayne Publishers , 1968
 Buku Teks SO