(1995). Virtus VRML toolkit. Indianapolis, Indiana: Hayden Books.
Trích dẫn kiểu ChicagoVirtus VRML Toolkit. Indianapolis, Indiana: Hayden Books, 1995.
MLA引文Virtus VRML Toolkit. Indianapolis, Indiana: Hayden Books, 1995.
警告：这些引文格式不一定是100％准确.
APA引文