Unity 2D Game Development Cookbook 2015

Chapter 1: Importing 3D Models and Animations
Chapter 2 : 2D Assets for Unity
Chapter 3 : Animating a Game Character
Chapter 4 : Taking Control
Chapter 5 : Building Up the Game Level
Chapter 6 : Game Scenes and the Graphic Interface
Chapter 7 : Improving Your Gaming Experience
Chapter 8 : Sprites, Spritesheets, and 2D Animation in Unity