Johann Wolfgang von Goethe
http://en.wikipedia.org/wiki/Johann_Wolfgang_von_Goethe
Wikipedia article on Goethe
the-sorrows-of-young-werther.com
http://www.the-sorrows-of-young-werther.com/
A website that will email Werther's letters to your inbox.
Project Gutenberg edition of The Sorrows of Young Werther
http://digital.library.upenn.edu/webbin/gutbook/lookup?num=2527
The text of the novel in the Carlyle/Boylan translation.
Jame's MacPherson's "Ossian"
http://solomonspalding.com/SRP/Ossian/MacPidx0.htm
1796 Edition of the Poems of Ossian
Catullus poem 2
http://rudy.negenborn.net/catullus/text2/e2.htm
One of Catullus' infamous bird poems.
Catullus poem 3
http://rudy.negenborn.net/catullus/text2/e3.htm
Another of Catullus' bird poems.
Dictionary of Sensibility
http://www.engl.virginia.edu/enec981/dictionary/intro.html
An excellent project started by the University of Virginia English Department that documents the rise of sentimental literature in the eighteenth century. Contains some examples from Werther.