Abstract
Get full access to this article
View all access options for this article.
References
1.
Blalock, H.M., Jr.
1964
Causal Inferences and Nonexperimental Data .
2.
Brink, Pamela
and
Marilynn
,
J. Wood
1978
Basic Steps in Planning Nursing Research.
Duxbury, North Scituate, MA .