Steadman, D. W., Martin, P. S., MacPhee, R. D. E., Jull, A. J. T., McDonald, H. G., Woods, C. A., . . . Hodgins, G. W. L. (2005). Asynchronous extinction of late Quaternary sloths on continents and islands. National Academy of Sciences.

Steadman, David W., Paul S. Martin, Ross D. E. MacPhee, A. J. T. Jull, H. Gregory McDonald, Charles A. Woods, Manuel Iturralde-Vinent, a Gregory W. L. Hodgins. Asynchronous Extinction of Late Quaternary Sloths On Continents and Islands. National Academy of Sciences, 2005.

Steadman, David W., et al. Asynchronous Extinction of Late Quaternary Sloths On Continents and Islands. National Academy of Sciences, 2005.