Perangkaan utama perkhidmatan profesional, saintifik dan teknikal lain mengikut taraf sah, 2010  [article] 
 Principal statistics of other professional, scientific and technical services by legal organisation, 2010  [article] 

 - Putrajaya :  Jabatan Perangkaan Malaysia,  2011 
<br/><br/> PTSL Dokumen (Page : 183), (Call Number : MK10 JPER 4 H378 2011)