McCullough, John (22 September 2014) WorldCat Discovery Services: OCLC presentation at ALA Annual 2014. OCLCVideo. YouTube. Retrieved 4 August 2015. start 4 minutes in YouTube (页面存档备份,存于互联网档案馆)
McCullough, John (22 September 2014) WorldCat Discovery Services: OCLC presentation at ALA Annual 2014. OCLCVideo. YouTube. Retrieved 4 August 2015. start 4 minutes in YouTube (页面存档备份,存于互联网档案馆)