Rolf, Ida P. <br/><br/>
Structural integration. 

 - London-GB :   Institute for the comparative study of History, philosophy and the scienes,   1963. 
 - páginas 66-83 :   ilustraciones blanco y negro 
 - Irregular 
 - Vol.I, no.1 (Jun.1963) 
 - Systematics. The journal of the Institute for the comparative study of history, philosophy and the sciences ;   no.1 .
 - Institute for the comporative study of history, philosophy and the sciences. .