1. A. W. Astin. What matters in college 1993. A. W. Astin. What matters in college 1993.
2. C. H. Crouch J. Watkins A. P. Fagen and E. Mazur. Peer instruction: Engaging students one-on-one all at once. Research-Based Reform of University Physics 1(1) 2007. C. H. Crouch J. Watkins A. P. Fagen and E. Mazur. Peer instruction: Engaging students one-on-one all at once. Research-Based Reform of University Physics 1(1) 2007.
3. Life's a game and the game of life
4. Evaluating a new exam question