TY  - BOOK
AU  - Barfield,Lon
TI  - The user interface: concepts & design 
SN  - 0201544415
AV  - QA76.9.U83 B35 1993
U1  - 004.21019 20
PY  - 1993///
CY  - Wokingham, England, Reading. Mass.
PB  - Addison-Welsey Pub. Co.
KW  - User interfaces (Computer systems)
N1  - Includes bibliographical references (p. 335-345) and index
ER  -