URL الوصول: http://europeana.eu/portal/record/09404/id_oai_rcin_org_pl_25337.html
الإتاحة: https://digitalcollections.jtsa.edu/islandora/object/jts%3A422749/datastream/TN/view/ARC%20MUS%2025%20-%20Richard%20J.%20Neumann%20Music%20Scores%2C%20Papers%2C%20Audio%20and%20Video%20Recordings.jpg