Büttner, August <br/><br/>
Zweierlei Denken :  Ein Beitrag zur Physiologie des Denkens  [electronic resource] / 
August Büttner 
 -  Project Gutenberg,  2007 
 - Project Gutenberg  22738 .
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text 
<br/><br/><label>Subjects--Index Terms: </label>Speeches, addresses, etc. Psychophysiology 
<br/><br/><label>LC Class. No.: </label>BF