Thoemmes Continuum publishes primary sources and reference works in the History of Ideas for the academic community.
http://www.thoemmes.com/404.asp?404;http://www.thoemmes.com/encyclopedia/cockburn.htm
http://faculty.msmc.edu/lindeman/dg7.htm
http://oregonstate.edu/instruct/phl302/philosophers/trotter.html
http://www.swif.uniba.it/lei/foldop/foldoc.cgi?Cockburn+Catherine+Trotter
http://www.geocities.com/Athens/Olympus/2601/cockburn.html
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