Nursing research :  methods and critical appraisal for evidence-based practice / 
[edited by] Geri LoBiondo-Wood, Judith Haber. 
 - 7th ed. 
 - St. Louis, Mo. :  Mosby/Elsevier,  2010. 
 - xvi, 601 p. :  ill. (some col.) ;  24 cm.