Cite web page as: Miscellaneous Buildings: roofing instructions, verso, undated, by Thomas Jefferson. MHi10 [electronic edition].
Thomas Jefferson Papers: An Electronic Archive. Boston, Mass. : Massachusetts Historical Society, 2003. http://www.thomasjeffersonpapers.org/
Original manuscript: Jefferson, Thomas. Miscellaneous Buildings: roofing instructions, 1 sheet, 2 pages, undated. More details about extent: 1 folded leaf with writing on p. 1 and dwgs on p. 4, pages 2 and 3 are blank. MHi10. Dimensions: 25.7 cm x 20.6 cm (10-1/8" x 8-1/8"). Original manuscript from the Coolidge Collection of Thomas Jefferson Manuscripts, Massachusetts Historical Society.