TY  - BOOK
AU  - Downton, Andy.
TI  - Engineering the Human-Computer Interface
SN  - 0071125868
U1  - 004.1 
PY  - 1991///
CY  - New York
PB  - McGraw-Hill Book Company
N1  - Following book also have Appendix A1 & A2
Appendix A1. Statistical tests for experimental evaluation
Appendix A2. Example Problems
ER  -