http://www.guardian.co.uk/commentisfree/belief/2011/apr/04/karl-marx-religion
http://www.guardian.co.uk/commentisfree/belief/2011/apr/11/marx-engels-science-marxism
http://www.guardian.co.uk/commentisfree/belief/2011/apr/18/karl-marx-men-make-history
http://www.guardian.co.uk/commentisfree/belief/2011/apr/25/karl-marx-communist-manifesto