Williams, F. J., Holzer, H., & Simon, J. Y. (2002). Judging Lincoln. Southern Illinois University Press.
Dyfyniad Arddull ChicagoWilliams, Frank J., Harold Holzer, and John Y. Simon. Judging Lincoln. Carbondale: Southern Illinois University Press, 2002.
Dyfyniad MLAWilliams, Frank J., et al. Judging Lincoln. Southern Illinois University Press, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.