University of Virginia article: Buchanan biography
Wheatland
James Buchanan at Tulane University
Essay on James Buchanan and his presidency from the Miller Center of Public Affairs
Buchanan's Birthplace State Park, Franklin County, Pennsylvania
"Life Portrait of James Buchanan", from C-SPAN's American Presidents: Life Portraits, June 21, 1999
Primary sources

Works by James Buchanan at Project Gutenberg
Works by James Buchanan at LibriVox (public domain audiobooks)
Works by or about James Buchanan at Internet Archive
James Buchanan Ill with Dysentery Before Inauguration: Original Letters Shapell Manuscript Foundation
Mr. Buchanans Administration on the Eve of the Rebellion. President Buchanans memoirs.
