Kamarudin, N.K. et al. 2020. Network Security Performance Analysis of Mobile Voice Over IP Application (mVoIP): Kakao Talk, WhatsApp, Telegram and Facebook Messenger. Journal of Computing Research and Innovation. 5, 2 (Apr. 2020), 21–27. DOI:https://doi.org/10.24191/jcrinn.v5i2.136.