Perangkaan utama perkhidmatan kejuruteraan mengikut negeri, 2010  [article] 
 Principal statistics of engineering services by state, 2010  [article] 

 - Putrajaya :  Jabatan Perangkaan Malaysia,  2011 
<br/><br/> PTSL Dokumen (Page :132), (Call Number : MK10 JPER 4 H378 2011)