Edgren, Lennart. <br/><br/>
Rituell kommunikation - ett "Sprak" Bortom Spraker. 

 - Suecia-SE :   The Ethographical Museum,   1983. 
 - páginas 38-59 :   ilustraciones blanco y negro 
 - Irregular 
 - (1983-1984) 
 - Ethnographical Museum, Gothenburg, Sweden ;    .
 - The Ethographical Museum, Gothenburg, Sweden. .