Robert Burns' "To a Mouse"
http://www.electricscotland.com/burns/mouse.html
The poem that contains the lines that Steinbeck borrowed for his title. Burns' poem resonates thematically with the novel beyond this mere borrowing. This link also features an audio file of the poem being recited in Scottish Brogue.
Ms. Culliton's Of Mice and Men Survival Page
http://www.jlc.net/~rwright/pages/OMM.html
A detailed study guide designed for high school students. Contains a comprehensive glossary.
Of Mice and Men PDF
http://us.penguingroup.com/static/pdf/teachersguides/ofmiceandmen.pdf
Clicking on this link will open a PDF file put together by Penguin. It's a well-done teacher's guide worth looking over.