1. Fang Yanjun. Sun Jian. Intelligent Instrument Technology and its Application. Beijing: Chemical Industry Press. 2003: 42–44.
2. Jiang Zhongliang, Chen Xiuyun. Measurement and Control of Temperature. Beijing: Tsinghua University Press, 2005: 26–27.
3. Chai Ruijuan. Chen Haixia. Siemens PLC Programming Technology and Engineering Applications. Machinery Industry Press. 2006: 8–14
4. Tang Yifan. Electrical and Programmable Logic Controller Technology. Machinery Industry Press. 2004
5. Ren Zhicheng. Application of Intelligent Digital Display Controller for Sensors and Transmitters. Beijing: China Electric Power Press. 2007: 85–96