Stephen R. Covey (2015). “The 7 Habits of Highly Effective People”, p.159, Mango Media Inc.
Chandler, Alfred Strategy and Structure: Chapters in the history of industrial enterprise, Doubleday, New York, 1962.
Wikipedia – Strategic planning: https://en.wikipedia.org/wiki/Strategic_planning
Mission, Vision, and Values. Authored by: John/Lynn Bruton and Lumen Learning. License: CC BY: Attribution: https://courses.lumenlearning.com/wm-principlesofmanagement/chapter/reading-mission-vision-and-values/