Whitehead Alfred North <br/><br/>
Principia mathematicsa to 56. 
Whitehead Alfred North; Russell Bertrand 
 - Cambridge  cambridge University Press          1962 
 - xlvi,410p  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>B, K2