2Comelie Leopold, Renata AG, Sheryl A Sorby. International experiences in developing the spatial visualization abilities of engineering students. In Journal for Geometry and Graphics,2001,5(1): 81-91.
3Huang Yuyu. Teaching system of engineering graphics toward the 21th century. Proceeding of the 2nd China-Japan Joint Conference on Graphics Education , China, 1995.
4CHEN Chikun.The Education of Mechanical Drawing Challenged by the Development of 3D Technology[C],2001.