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,
 Buku Teks
Vigran, Tor Erik
Building acoustics
Taylor and Francis, 2008
 Buku Teks SO