Dilenschneider, Robert L.
Gou tong shi dai hua ling dao = a briefing for leaders: communications as the ultimate exercise of power = 溝通時代話領導
Tian Xia Wen Hua, 1994
 Buku Teks
Everling, Wolfgang
Exercise in computer systems analysis
Springer-Verlag, 1975
 Buku Teks
Duckson, Don W.
Exercise in physical geography
McGraw-HIll, 1999
 Buku Teks
Long, G. Gilbert
Problem exercise for general chemistry
John Wiley & Sons, 1982
 Buku Teks
Hornby, Albert Sydney
Composition exercise in elementary English
Macmillan, 1951
 Buku Teks