Trump/Russia: A Definitive History, by Seth Hettena.
House of Trump, House of Putin: The Untold Story of Donald Trump and the Russian Mafia, by Craig Unger.
Collusion: Secret Meetings, Dirty Money, and how Russia Helped Donald Trump Win, by Luke Harding.
The Apprentice: Trump, Russia and the Subversion of American Democracy, by Greg Miller.
Proof of Collusion: How Trump Betrayed America, by Seth Abramson.