2009, 121 (877): 213. Bibcode:2009PASP..121..213C. doi:10.1086/597811. Urquhart, J. S.; Figura, C. C.; Moore, T. J. T.; Hoare, M. G.; Lumsden, S. L.; Mottram
"Reinhold Niebuhr" (页面存档备份,存于互联网档案馆), Time Magazine Cover (Mar. 8 1948) BrianUrquhart, "What You Can Learn from Reinhold Niebuhr" (页面存档备份,存于互联网档案馆), The New
AC, Milner, AR, Morris, N, Owen, E, Rosen, BR, Smith, AB, Taylor, PD, Urquhart, E & Young, JR. The Cretaceous–Tertiary biotic transition. Journal of the