"Wayback Machine". web.archive.org. 2004-12-10. Archived from the original on 2004-12-10. Diakses tanggal 2022-01-13.Pemeliharaan CS1: Url tak layak (link)
webcitation.org
"Salinan arsip". Archived from the original on 2009-12-24. Diakses tanggal 2014-05-23.Pemeliharaan CS1: Url tak layak (link)