Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://www.ips.org.ar/?p=5766
https://www.biografiasyvidas.com/biografia/t/trotski.htm
https://es.wikipedia.org/wiki/León_Trotski
https://www.ecured.cu/León_Trotsky
https://thewire.in/history/leon-trotsky-the-socialist-who-dreamt-of-the-full-human-life-even-at-his-nadir
https://www.txalaparta.eus/es/libreria/autores/leon-trotsky
http://www.corrienteroja.net/quien-fue-leon-trotsky/
http://www.taotv.org/2013/09/28/leon-trotsky-cinico-y-sadico/