1. Nuclear Gene Sequences from a Late Pleistocene Sloth Coprolite
Hendrik Poinar, Melanie Kuch, Gregory McDonald, Paul Martin, Svante Pääbo 
Current Biology 
Volume 13, Issue 13, Pages (July 2003)
DOI: /S (03)

2. Figure 1 Phylogenetic Tree of Extant and Extinct Xenarthran
Neighbor joining tree relating the Shasta ground sloth to extant sloths, anteaters, and armadillos by using the hyrax as an outgroup.
Current Biology  , DOI: ( /S (03) )