(eBook PDF)Gamification by Design: Implementing Game Mechanics in Web and Mobile Apps by Gabe Zichermann $9.99 Add to Cart
(eBook PDF)Cognitive Science An Introduction to the Science of the Mind 3rd Edition by José Luis Bermúdez $19.90 Add to Cart
(eBook PDF)Comparative Politics Integrating Theories, Methods 4th by J. Tyler Dickovick , Jonathan Eastwood , Robin M. LeBlanc , Zoila Ponce de Leon $25.99 Add to Cart
