TY  - BOOK
AU  - Polit,DF
AU  - Beck CT
TI  - Nursing research: generating and assessing evidence for nursing practice 
SN  - 9781451109146
PY  - 2012///
CY  - Philadelphia
PB  -  Wolters Kluwer / Lippincott Williams & Wilkins
KW  - Nursing research
ER  -