title: Research methods: a primer of experimental and nonexperimental designs.
authors.forename: V B
authors.initials: VB
authors.lastname: Whitaker
authors.forename: C A
authors.initials: CA
authors.lastname: Dill
mesh_terms: D015400:Clinical Nursing Research / Q000379:methods*; D006801:Humans; D015399:Nursing Research / Q000379:methods*; D012107:Research Design