Perangkaan utama perkhidmatan pakar runding pengurusan dan penyelidikan pasaran mengikut taraf sah, 2010  [article] 
 Principal statistics of management consultancy and market research services by legal organisation, 2010  [article] 

 - Putrajaya :  Jabatan Perangkaan Malaysia,  2011 
<br/><br/> PTSL Dokumen (Page : 173), (Call Number : MK10 JPER 4 H378 2011)