I would like to express that I read all the references citing a specific paper listed by Google scholar. I would like to add a specific date to that sentence. Is one of the following ways to do this correct? Or is there a more suitable preposition than "as of"?
I read all the 42 references citing A listed by Google Scholar (as of March 29, 2016).
I read all the 42 (as of March 29, 2016) references citing A listed by Google Scholar