Bailey, W. J. , K. Hayasaka, C. G. Skinner, S. Kehoe, L. C. Sieu, J. L. Slightom, and M. Goodman. Reexamination of the African hominoid trichotomy with additional sequences from the primate beta-globin gene cluster. Brunet, M., A. Beauvilain, Y. Coppens, E. Heintz, A.H.E. Moutaye, and D. Pilbeam. Collard, M. and B. Wood. Gagneux, P., C. Wills, U. Gerloff, D. Tautz, P. A. Morin, C. Boesch, B. Fruth, G. Hohmann, O. A. Ryder, and D. S. Woodruff.
Mitochondrial sequences show diverse evolutionary histories of African hominoids.
Gonzalez, I. L. , J. E. Sylvester, T. F. Smith, D. Stambolian, and R. D. Schmickel. Ribosomal RNA gene sequences and hominoid phylogeny. Goodman, M., D. A. Tagle, D. H. A. Fitch, W. Bailey, J. Czelusniak, B. F. Koop, P. Benson, and J. L. Slightom. 1990. Primate evolution at the DNA level and a classification of hominoids. Haile-Selassie, Y. 2001.