These books at the Peoria Campus Library have sections about using concept mapping in nursing diagnosis!
Nursing Diagnosis: application to clinical practice
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Nursing Diagnosis Manual: planning, individualizing, and documenting client care
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Concept mapping is a tool used to help nurses organize their thoughts for care planning. This slide show gives a quick overview of concept mapping that may help you in learning this skill.
Here is Chapter 5 from Introduction to Concept Mapping in Nursing by Patricia Schmehl and published by Jones and Bartlett.