====== Bibliographic formats ======

  * https://en.wikipedia.org/wiki/Resource_Description_and_Access
  * http://www.rda-rsc.org/content/about-rda
  * Fotis Lazarinis: Cataloguing and Classification: An introduction to AACR2, RDA, DDC, LCC, LCSH and MARC 21 Standards. Chandos Publishing, 	2014.
  * https://www.oclc.org/bibformats/en.html
  * http://www.loc.gov/marc/RDAinMARC.html
  * https://authorities.loc.gov/
  * https://lccn.loc.gov/n2004091456
  * http://viaf.org/