ma jamil,zaleha a mahdy,nor azlin mi,harlina halizah,shuhaila a,norzilawati mn,tan ay,ani amelia z,yh lim,ps lim,natasha mn,ixora ka,chris cy lee,rohana j,nirmala ck,shafiee mn,fadzila mp,fauziah ah,n.  (2008).  handbook of labour room practice: a comprehensive guide to the management of women in labour.  - .  296. 

m a jamil m yassin, zaleha a mahdy, shuhaila ahmad, nor azlin mohd ismail, norzilawati mohd naim.  (2002).  handbook of labour room practice.  - .  109.