Theories of nursing that are Middle-Range tend to be more specific in focus and offer more concrete connections between Grand Nursing Theories and Nursing Practice. The concepts of Middle-Range theories tend to be less abstract and tend to me more verifiable through testing. These theories can often attempt to describe, explain, or predict certain phenomenon in clinical practice.
Middle Range Theory for Nursing by 
Middle Range Theory Development Using King's Conceptual System by 
Transitions Theory: Middle Range and Situation Specific Theories in Nursing Research and Practice by 
Generating Middle Range Theory by