David & Karen 
Designing Games for Ethics: Models, Techniques and Frameworks [PDF ebook] 

As games become increasingly embedded into everyday life, understanding the ethics of their creation and use, as well as their potential for practicing ethical thinking, becomes more relevant. Designing Games for Ethics: Models, Techniques and Frameworks brings together the diverse and growing community of voices and begin to define the field, identify its primary challenges and questions, and establish the current state of the discipline. Such a rigorous, collaborative, and holistic foundation for the study of ethics and games is necessary to appropriately inform future games, policies, standards, and curricula.