and finally an online source for:
Karl Marx, Theses on Feuerbach Written: Spring 1845 Source: Marx/Engels Selected Works, Volume One, p. 13 - 15 First Published: Appendex to Engels' Ludwig Feuerbach and the End of Classical German Philosophy, 1886
<http://www.marxists.org/archive/marx/works/1840/theses.htm> respectively <http://csf.colorado.edu/mirrors/marxists.org/archive/marx/works/1840/theses .htm>
All the best for your talk today, Chris!
HK