TY  - BOOK
AU  - Helsel,Sandra K.
AU  - Roth,Judith Paris
TI  - Virtual reality: theory, practice, and promise 
SN  - 0-88736-728-3 :
AV  - BD 331 .V57 1991
PY  - 1991///
CY  - Westport
PB  - Meckler
KW  - Reality
KW  - Virtual reality
KW  - Technology
KW  - Philosophy
KW  - Computers
N1  - Includes bibliographical references and index
ER  -