A medallion of two roman emperors. 

 - Missouri-US :   University of Missouri-Columbia,   1968. 
 - páginas 21-24 :   ilustraciones blanco y negro 
 - Anual 
 - No.2 (1968) 
 - MUSE. Annual of the Museum of art and archaeology ;   no.2 .
 - University of Missouri-Columbia. .