Lwanga, S. K <br/><br/>
Sample size determination in health studies :  a practical manual / 
S.K Lwanga  and Lemeshow S. 
 - Geneva :  World Health Organization,  1991. 
 - Viii, 80 p. :  ill. ;  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sample Studies<br/>Health surveys.