• https://virtualspeech.com/blog/history-of-vr
• 피그말리온의 안경 전문: https://www.gutenberg.org/files/22893/22893-h/22893-h.htm
• https://techcrunch.com/2014/03/26/a-brief-history-of-oculus/
• http://graphics.wsj.com/3d-nasdaq/
• Understanding Virtual Reality: Interface, Application, and Design, William R Sherman 저
• 웹디자인용어: 어포던스란? Ian Yates
• This should be V.R.’s moment. Why is it still so niche? New York Times