I am referencing someone else's work, specifically an Appendix which contains ~100 news article URLs. For example, "bla bla bla (Author, Appendix A, article 5)". The reason I do this, is simply to avoid duplication. If someone needs to know the article URL, they can simply check the appendix in the reference work.
However, at the same time, one should generally try to cite primary sources in academia, and also the article was not written by the Author but by a news site, so from this point of view it would be better to include the article URLs in my own appendix, would it not ?