http://unfollow.com.gr/web-only/7186-richleft/

http://leninreloaded.blogspot.gr/2012/11/friedrich-engels.html

http://www.narnet.gr/articles/%CE%B4%CF%85%CE%BD%CE%AC%CE%BC%CE%B5%CE%B9%CF%82-%CF%84%CE%BF%CF%85-%CE%BA%CE%BF%CE%BC%CE%BC%CE%BF%CF%85%CE%BD%CE%B9%CF%83%CE%BC%CE%BF%CF%8D

http://erodotos.wordpress.com/2011/06/09/krisi-marx-engels-lenin-stalin/