Abstract

Get full access to this article
View all access options for this article.
References
1.
Campbell, D.T.
, &
Stanley, J.C.
Experimental and Quasi-experimental designs for research . Chicago : Rand-McNally , 1966 .
2.
Polit, D.
, &
Hungler, B.
Nursing research: Principles and methods . Philadelphia : J. B. Lippincott , 1978 .
