Deletion of State management (NLP)

Comment: There seem to be numerous sources covering the concept of state management such as ''Gower Handbook of Leadership and Management Development''; ''Ahead of the Game''; ''NLP for Project Managers''; &c.  There are obvious alternatives to deletion such as merger with the main article about Neuro-linguistic programming|NLP or a similar article such as mood management theory.  It therefore seems that  has not been followed and we should not delete a large heterogeneous bundle without such due diligence
Stance: keep
Cited policy: Wikipedia:Articles for deletion (WP:BEFORE)