- https://altraradio.wordpress.com/2020/05/08/laltra-radio-de-radio-4-celebra-els-40-anys-amb-lindicatiu-especial-am40lar/
- https://www.facebook.com/programa.altraradio/posts/3089907784365833
- https://twitter.com/altraradio/status/1258814241928286211
- https://www.linkedin.com/pulse/laltra-r%25C3%25A0dio-de-4-celebra-els-40-anys-amb-lindicatiu-especial-niqui
- https://blocs.mesvilaweb.cat/telecomunicacions/?p=267199
- https://mikedeltavictor.com/mike-delta-victor-dx-group-participara-en-lactivitat-am40lar-40-aniversari-laltra-radio/
- http://www.arcat.info/?p=1099
- http://www.radioaficionats.cat/radioaficionats/indicatiu-especial-am40lar-en-el-40e-aniversari-de-laltra-radio/
- https://www.facebook.com/RADIOAFICIONAT/posts/2930043320365043
- http://guiadelaradio.com/laltra-radio-de-radio-4-celebra-los-40-anos-con-el-indicativo-especial-am40lar
- https://comunicacio21.cat/noticies/els-radioaficionats-commemoren-els-40-anys-de-laltra-radio/
- http://www.southgatearc.org/news/2020/may/am40lar.htm#.Xru2B9ZxfIU
- https://www.darc.de/fileadmin/filemounts/referate/dx/Bulletins/DXNL/dxnl2197.txt
- https://www.darc.de/fileadmin/filemounts/referate/dx/Bulletins/DXMB-PDF/dxmb2197.pdf
- https://www.darc.de/fileadmin/filemounts/referate/dx/Bulletins/DXMB/dxmb2197.txt
- https://www.rtve.es/rtve/20200513/laltra-radio-radio-4-celebra-els-40-anys-demissions-amb-els-radioaficionats/2013954.shtml
- https://www.facebook.com/Radio4RNE/posts/1630867080413663
- https://mediavod-lvlt.rtve.es/resources/TE_SLALTR/mp3/3/4/1589282280443.mp3
- http://www.gentedigital.es/catalunya/noticia/2878648/el-programa-laltra-radio-de-radio-4-celebra-40-anos-con-radioaficionados/
- https://www.europapress.es/catalunya/noticia-programa-laltra-radio-radio-celebra-40-anos-radioaficionados-20200513193509.html
- http://ufrc.org/info/am40lar-40e-anniversaire-de-lemission-radioamateur/
- http://www.radioamateurs.news.sciencesfrance.fr/?p=128171
- https://www.ure.es/am40lar-qsl-y-diploma/
- https://elradioescucha.net/2020/05/14/laltra-radio-de-radio-4-celebra-els-40-anys-demissions-amb-els-radioaficionats/
- http://ea3rch.org/index.php/es/8-noticias/200-40-altra-radio-es
- http://www.summersidearc.com/index.php/2020/05/13/am40lar-40th-anniversary/
- https://mangsebyo.com/?p=17676
- http://www.arrl.org/w1aw-bulletins-archive/ARLD020/2020
- https://www.linkedin.com/pulse/%C3%A8xit-internacional-de-lindicatiu-especial-am40lar-per-cinto-niqui?articleId=6673095483457581056#comments-6673095483457581056&trk=public_profile_article_view
- https://blocs.mesvilaweb.cat/telecomunicacions/?p=267203
- http://guiadelaradio.com/exito-internacional-del-indicativo-especial-am40lar-para-celebra-los-40-anos-de-laltra-radio-de-radio-4
- https://www.rtve.es/rtve/20200602/40-anys-laltra-radio-amb-els-radioaficionats-exit-internacional/2015388.shtml