http://www.answers.com/topic/friedrich-engels
www.infoplease.com/encyclopedia/history/february-revolution-french-history.html
http://isreview.org/issues/02/engles_family.shtml
http://www.workersliberty.org/node/7357
http://www.marxists.org/history/etol/newspape/socialistvoice/womenPR34.html
http://en.wikipedia.org/wiki/The_Origin_of_the_Family,_Private_Property_and_the_State
http://www.marxists.org/archive/marx/works/1884/origin-family/
http://www.rlwclarke.net/courses/LITS2307/2004-2005/11BEngelsOriginoftheFamily,PrivatePropertyandtheState.pdf
http://isreview.org/issues/02/engles_a.shtml
http://www.therealpresence.org/archives/Communism/Communism_003.htm
http://isreview.org/issues/02/engles_family.shtml
http://www.marx2mao.com/M&E/PPL76.html#s2
http://www.marxists.org/archive/lenin/works/1917/staterev/ch01.htm
www.infoplease.com/encyclopedia/history/february-revolution-french-history.html
http://isreview.org/issues/02/engles_family.shtml
http://www.workersliberty.org/node/7357
http://www.marxists.org/history/etol/newspape/socialistvoice/womenPR34.html
http://en.wikipedia.org/wiki/The_Origin_of_the_Family,_Private_Property_and_the_State
http://www.marxists.org/archive/marx/works/1884/origin-family/
http://www.rlwclarke.net/courses/LITS2307/2004-2005/11BEngelsOriginoftheFamily,PrivatePropertyandtheState.pdf
http://isreview.org/issues/02/engles_a.shtml
http://www.therealpresence.org/archives/Communism/Communism_003.htm
http://isreview.org/issues/02/engles_family.shtml
http://www.marx2mao.com/M&E/PPL76.html#s2
http://www.marxists.org/archive/lenin/works/1917/staterev/ch01.htm