A cognitive model of depression is given by -
Aron Beck postulated a cognitive triad of depression that consists of

1) View about the self → a negative self-precept;
2) About the environment → A tendency to experience the world as hostile and demanding, 
3) About the future → Expectation of suffering and failure. 

Cognitive therapy consists of modifying these distortions.
Ellis
Beck
Godfrey
Meicheinbanon