You'll never find online references or references of any sort, what your describing never occurred.
It did occur and you can find a cryptic reference to it in Paulus Orosius -
History against the Pagans vi.15.32. Here is the passage translated into English:
So perished that marvelous monument of the literary activity of our ancestors, who had gathered together so many great works of brilliant geniuses. In regard to this, however true it may be that in some of the temples there remain up to the present time book chests, which we ourselves have seen, and that, as we are told, these were emptied by our own men in our own day when these temples were plundered—this statement is true enough—yet it seems fairer to suppose that other collections had later been formed to rival the ancient love of literature, and not that there had once been another library which had books separate from the four hundred thousand volumes mentioned, and for that reason had escaped destruction.
He is talking about the destruction of the library at the time of Julius Caesar, but then he concedes that there was another destruction of libraries within temples during his own lifetime by "our men" i.e. the Christian mob.
If you want another event to add to your timeline then how about:
1268 - Baibars captured the city of Antioch and massacred the 40,000 Christian residents.
wikipediaThe wikipedia article says 40,000 Christians killed and cites Michaud, The History of the Crusades, Vol. 3, p. 18 as the source.
In Rodney Stark's "God's Battalions" I think I remember reading that the number killed was 17,000.
But what is the ultimate purpose of a timeline of Muslims attrocities? Where will it be posted? What is the point of producing such a one-sided account of history? You won't win anyone over by that, people will immediately recogoinze it for what it is, a one-sided account. It would make more sense to produce a list of all attrocities, Muslim and non-Muslim.