The LEGO MINDSTORMS NXT 2.0 Discovery Book: A Beginner's Guide to Building and Programming Robots, Valk, Laurens, eBook - Amazon.com
HiTechnic NXT EOPD – Modern Robotics Inc
Amazon.com: LEGO MINDSTORMS EV3 31313 Robot Kit with Remote Control for Kids, Educational STEM Toy for Programming and Learning How to Code (601 Pieces) : Toys & Games