APA Citation
Carnegie, Andrew,. Andrew Carnegie letter to Colonel Edward Jay Allen, dated Skibo Castle, Dornoch, Sutherland, 19 June 1905. Retrieved from https://library.si.edu/digital-library/book/andrewcarnegiel00carn
MLA Citation
Carnegie, Andrew,. Andrew Carnegie letter to Colonel Edward Jay Allen, dated Skibo Castle, Dornoch, Sutherland, 19 June 1905. https://library.si.edu/digital-library/book/andrewcarnegiel00carn
Chicago
Carnegie, Andrew,. Andrew Carnegie letter to Colonel Edward Jay Allen, dated Skibo Castle, Dornoch, Sutherland, 19 June 1905. https://library.si.edu/digital-library/book/andrewcarnegiel00carn
Warning: These citations may not always be complete (especially for serials).