Koch, Edward T.
Kencana Prenada Media Group, 2008
Buku Teks
Morris, Kenneth M.
Lightbulb Press, 1998
Buku Referensi
ASEAN Secretariat, 1999
Buku Teks
edited by William Wels
Lippincott Williams & Wilkins, 2003
Buku Teks
Goncalves, Marcus
McGraw-Hill , 2000
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