http://citation.dbpedia.org/hash2/f9dbb0792a7ab5b83fe78d886ce1b52e2e11561d0cfb750769f91806196412f1
615
https://recordresearch.com/pdf/dancedisco.pdf
3
http://books.google.com/books?vid=ISBN9780898201567
2
http://books.google.com/books?vid=ISBN089820156
1