MLA

Blackman, Sue, and Robert Reed. Beginning 3d Game Development with Unity 4. Apress, 2013.

APA

Blackman, S., & Reed, R. (2013). Beginning 3D Game Development with Unity 4. Apress.

Chicago

Blackman, Sue, and Robert Reed. Beginning 3D Game Development with Unity 4. : Apress, 2013.