Collected works 

 - London  Routledge         1981 
 - 33v 
<br/><br/><label>ISBN: </label>0415048788 (hbk) 
<br/><br/><label>Standard No.: </label>51112 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>R3xM06x, M1.30-;1 (RR)