Intrinsic Motivation and Self-Determination in Human Behavior (Perspectives in Social Psychology)

 This book is primarily about self-determination and competence (with particular emphasis on the former), and about the processes and structures that relate to these needs. The need for interpersonal relat­edness, while no less important, remains to be explored, and the findings from those explorations will need to be integrated with the present theory to develop a broad, organismic theory of human motivation. 

By Edward Deci, Richard M. Ryan