Zari Mahmood
Putrajaya: scenic sights & attractions
Amber Pacific, 2005
 Buku Referensi
Zari Mahmood
Putrajaya : scenic sights & attractions / Zari Mahmood
Amber Pacific Sdn Bhd, 2005
 Buku Referensi
Henso, Truman
Binoculars telescopes and telescopic sights; how they work, howto selec them, and how to design and build your own
Greenberg, 1953
 Buku Teks SO
Mackie, Benita
Building sentences
Upper Saddle River,N.J. Prentice Hall 1995,
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Adi Soenarno
Team building
Andi Offset, 2006
 Buku Teks