Analysis of information sources in references of the Wikipedia article "List of Grimm episodes" in English language version.
For the second season, see "Grimm: Season Two Ratings". TV Series Finale. May 22, 2013. Retrieved October 17, 2018.
For the third season, see "Grimm: Season Three Ratings". TV Series Finale. May 17, 2014. Retrieved October 17, 2018.
For the fourth season, see "Grimm: Season Four Ratings". TV Series Finale. May 18, 2015. Retrieved October 17, 2018.
For the fifth season, see "Grimm: Season Five Ratings". TV Series Finale. May 21, 2016. Retrieved October 17, 2018.
For the sixth season, see "Grimm: Season Six Ratings". TV Series Finale. April 3, 2017. Retrieved October 17, 2018.