Help talk:References

Citing source for Chyler Silva

I have been attempting to cite a source for Chyler Silva from YouTube, particularly for the Production Notes section. I found additional information about the books that Anna Popplewell, the actress who portrays Chyler, did for the role. However, none of the methods I tried, including following the instructions on the page and replicating the format of the other two sources in the same section, seem to be working. I am quite confused. What am I doing wrong? Please help. This is the link https://www.youtube.com/watch?v=EcOvnotxhk4