Soren, David. <br/><br/>
A portrait of  the empress crispina. 

 - Missouri-US :   University of Missouri-Columbia,   1975. 
 - páginas 21-24 :   ilustraciones blanco y negro 
 - Anual 
 - No.9 (1975) 
 - MUSE. Annual of the Museum of art and archaeology ;   no.9 .
 - University of Missouri-Columbia. .