1. Warr, P. eSports in Numbers: Five Mind-Blowing Stats. Redbull. https://www.redbull.com/int-en/esports-in-numbers-five-mind-blowing-stats (2014).
2. Eko, G., Reddy, S. H., Hermawan, A., & Achmad, S. Intranet/Internet Game Online. Makalah. Fakultas Teknologi Industri UPN Veteran Yogyakarta (2009).
3. Information from: www.mmodata.net. Tracking of active MMORPG subscriptions. www.mmodata.net. (2010).
4. The Unbearable Likeness of Being Digital: The Persistence of Nonverbal Social Norms in Online Virtual Environments
5. Yohan, W. E-Lifestyle dan Motif Pelajar di Yogyakarta dalam Menggunakan Permainan Online. E-Journal Universitas Atma Jaya Yogyakarta, 4, 53–54 (2011).