In this article, you will find some useful information about mission statements: https://www.thebalancesmb.com/mission-statement-2947996
In this article, you will find some successful examples of mission statements
In these links, you will better understand what is strategy and strategic planning:
Community Tool Box (2018) Chapter 8: https://ctb.ku.edu/en/table-of-contents/structure/strategic-planning
In these articles you will find more about vision statements, including some examples: https://www.thebalancesmb.com/vision-statement-2947999
If you are more of a visual learner, you can also watch these videos:
How to write a mission statement: https://www.youtube.com/watch?v=1xs4I349cdc
Identifying Your Organization-Wide Strategies: https://www.youtube.com/watch?v=VRW0JoTU9OQ
What is Strategic Planning, Really?: https://www.youtube.com/watch?v=mLJ34L5UW4E
How to write a vision statement: https://www.youtube.com/watch?v=7yBUBmciQBk
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/