http://www.theatredatabase.com/20th_century/bertolt_brecht_timeline.html
http://www.theatredatabase.com/20th_century/bertolt_brecht_001.html
http://faculty.oxy.edu/gratch/design-forum2/brecht-timeline.pdf
http://en.wikipedia.org/wiki/Bertolt_Brecht
http://www.spartacus.schoolnet.co.uk/USAbrecht.htm
http://analepsis.org/2008/12/31/a-worker-reads-history/
news.bbc.co.uk/dna/place-lancashire/plain/A4986840
http://www.sussex.ac.uk/Users/desw/galileo/issues/communism.html
http://www.theatredatabase.com/20th_century/bertolt_brecht_001.html
http://faculty.oxy.edu/gratch/design-forum2/brecht-timeline.pdf
http://en.wikipedia.org/wiki/Bertolt_Brecht
http://www.spartacus.schoolnet.co.uk/USAbrecht.htm
http://analepsis.org/2008/12/31/a-worker-reads-history/
news.bbc.co.uk/dna/place-lancashire/plain/A4986840
http://www.sussex.ac.uk/Users/desw/galileo/issues/communism.html