Haak V.M <br/><br/>
A penny for your thought:  investigating the validity and reliability of think-aloud protocols for usability testing/ 
Maaike van den Haak 
 - Enschede:  University of twente,  2008. 
 - 188P.:  ill.;  24 cm 
<br/><br/> includes bibliographical references. 
<br/><br/><label>ISBN: </label>9789090232164 
<br/><br/><label>LC Class. No.: </label>DUCE GN346.4H.57