Bullock, Barbara
Focus on pathophysiology
Lippincott , 2000
 Buku Teks
Berman, Harold J.
The Russians in focus
Little, Brown, 1953
 Buku Teks
Focus on the Netherlands
Ministry of Foreign Affairs Netherlands, Communication Division (DVL/VB) ,
 Buku Teks
Hahn, Dale B.
Focus on health
McGraw-Hill, 2002
 Buku Teks
Hahn, Dale B.
Focus on health
McGraw-Hill, 2003
 Multimedia