Select a nursing theory used in nursing leadership and explain its importance in

Select a nursing theory used in nursing leadership and explain its importance in healthcare system.
Guidelines:
APA Format
MUST utilize credible data sources such as CINAHL, MEDLINE, Embase, ClinicalKey, The Cochrane Library. Library resources can be accessed from the Library page at the FNU.edu website. FNU Librarians are available to assist each student with retrieving the required scholarly content.
Research paper must be 500 words
3 or more scholarly sources must be utilized
Sources must be within the last 5 years
Must have a minimum of 3 Sources
All article sources must be cited by including them in reference sheet (separate).