# Trotsky: A Biography by Robert Service; Trotsky: Downfall of a Revolutionary by Bertrand M. Patenaude
**Wikidata**: [Q101229552](https://www.wikidata.org/wiki/Q101229552)  
**Source**: https://4ort.xyz/entity/trotsky-a-biography-by-robert-service-trotsky-downfall-of-a-revolutionary-by-bertrand-m-patenaude