Coba jelasin Renton, David (2004) Trotsky. dari Leon Trotski dong

Rogovin, Vadim Z. (1998). 1937 Stalin's Year of Terror. Oak Park, MI: Mehring Books, Inc.

Rubenstein, Joshua. (2013) Leon Trotsky: A Revolutionary's Life (2013)

Service, Robert (2005). Stalin: A Biography. Cambridge: Belknap Press.  online free to borrow.

Service, Robert (2009). Trotsky: A Biography. Macmillan Publishers.

Swain, Geoffrey. Trotsky (2006) Routledge, excerpt and text search

Thatcher, Ian D. (2003) Trotsky.

Dimitri Volkogonov (1996) Trotsky, the Eternal Revolutionary. Free Press.     online free to borrow

Wolfe, Bertram D. (1948) Three Who Made a Revolution: A Biographical History of Lenin, Trotsky, and Stalin (1948)  online  free to borrow, ends in 1914.

The Modern Encyclopedia of Russian and Soviet History, Volume 39, Academic International Press