TY  - BOOK
AU  - Haak V.M
TI  - A penny for your thought: investigating the validity and reliability of think-aloud protocols for usability testing
SN  - 9789090232164
AV  - DUCE GN346.4H.57 
PY  - 2008///
CY  - Enschede
PB  - University of twente
N1  - includes bibliographical references
ER  -