Analysis of information sources in references of the Wikipedia article "List of Billions episodes" in English language version.
For the second season, see "Billions: Season Two Ratings". TV Series Finale. May 9, 2017. Retrieved October 24, 2019.
For the third season, see "Billions: Season Three Ratings". TV Series Finale. June 12, 2018. Retrieved October 24, 2019.
For the fourth season, see "Billions: Season Four Ratings". TV Series Finale. June 11, 2019. Retrieved October 24, 2019.
For the fifth season, see "Billions: Season Five Ratings". TV Series Finale. May 5, 2020. Retrieved May 8, 2020.
For the sixth season, see "Billions: Season Six Ratings". TV Series Finale. January 25, 2022. Retrieved January 25, 2022.