Nicolay, H. (2006). Personal Traits of Abraham Lincoln. Stackpole Books.
Chicago-čujuhus (17. p.)Nicolay, Helen. Personal Traits of Abraham Lincoln. Mechanicsb urg: Stackpole Books, 2006.
MLA-čujuhus (9. p.)Nicolay, Helen. Personal Traits of Abraham Lincoln. Stackpole Books, 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.