Whitehead, Alfred North. <br/><br/>
Principia mathematica to *56 / 
by Alfred North Whitehead and Bertrand Russell. 
 - 2nd ed. 
 - Cambridge :  Cambridge University Press,  1927. 
 - xlvi, 410 p. ;  22 cm. 
 - Cambridge mathematical library. .
<br/><br/><label>ISBN: </label>052109187X (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Philosophy.<br/>Logic, Symbolic and mathematical.