Gupta, Tannu, A Sudha Madhuri, Prachi Prachi, M Jaleel Akhtar, and K Vaibhav Srivastava. 2012. “Development of the Virtual Lab Module for Understanding the Concepts of Electric and Magnetic Field Patterns in Rectangular Waveguides and Cavities”. International Journal of Online and Biomedical Engineering (iJOE) 8 (3):pp. 12-21. https://doi.org/10.3991/ijoe.v8i3.2113.