I gotta admit that as books are coming in that start to move into covering the Trump administration it's funny to see how they cite and use his Twitter statements. Some people are like "nope" and just cite articles citing his tweets, others just give up and do "Donald Trump, @RealDonaldTrump, Twitter" because that's clearly the only way to do this.
Like this National Security Council book, for them talking about Reagan/Bush/Obama it's something like "the Obama team felt the Pentagon was working against them" with the citation being like some long form NYTimes article or Bob Woodward book or interview with a NSC member. But for Trump it's all like "Trump felt the deep state was opposing him" and the citation is Trump, on Twitter, "DEEP STATE! SAD!" It's like the Reagan Diaries, but in real time and no rewriting like Reagan did.