https://www.seti.org/humankind-just-beamed-signal-space-aliens-was-bad-idea
https://www.livescience.com/messages-sent-to-aliens.html
https://voyager.jpl.nasa.gov/golden-record/whats-on-the-record/
https://www.newscientist.com/article/dn18417-earth-calling-a-short-history-of-radio-messages-to-et/
https://www.livescience.com/56886-arrival-movie-alien-contact-protocol.html
https://www.seti.org/protocols-eti-signal-detection
https://www.livescience.com/56886-arrival-movie-alien-contact-protocol.html
https://www.seti.org/zoo-hypothesis-may-explain-why-we-havent-seen-any-space-aliens
https://www.npr.org/transcripts/901705799
https://slate.com/culture/2016/11/a-linguist-on-arrival-s-alien-language.html