:Bibliography-
::*{{ListRef|Grieg 1940|p.64-66}}
::*{{ListRef|Żabiński 2007|no.16}}
::*[http://www.nms.ac.uk/explore/search-our-collections/collection-item/?item_id=167494 National Museum of Scotland]
::*[http://nms.scran.ac.uk/database/record.php?usi=000-100-043-704-C nms.scran.ac.uk]