Chakadini, Hilda. <br/><br/>
Shift work system as a contributory factor towards absenteeism among PTC Harare Exchange operators :  case study / 
by Hilda Chakadini. 
 - [S.l. :  s.n.],  1986. 
 - iii, 37, 7 leaves. 
<br/><br/>Thesis (B.S.W.)--University of Zimbabwe, 1986.