1. Albert, R., Hofer, H., East, M. L., and Pitra, C., 2000, Genetische Identifizierung der geographischen Herkunft von Tupfelhyänen (Crocuta crocuta Erxleben 1777),Zool. Garten N.F.69:1–10.
2. Albone, E. S., 1984,Mammalian semiochemistry: the investigation of chemical signals between mammals, John Wiley, Chichester.
3. Apps, P., Viljoen, H. W., Richardson, P. R. K., and Pretorius, V., 1989, Volatile components of the anal gland secretion of the aardwolf(Proteles cristatus). J. Chem. Ecol. 15:1681–1688.
4. Buglass, A. J., Darling, F. M. C, and Waterhouse, J. S., 1990, Analysis of the anal sac secretion of the Hyaenidae, in:Chemical Signals in Vertebrates 5, (D. W. Macdonald, D. Müller-Schwarze, and S. E. Natynczuk, eds.), Oxford University Press, Oxford, pp. 65–69.
5. East, M. L., and Hofer, H., 1991, Loud calling in a female-dominated mammalian society: I. Structure and composition of whooping bouts of spotted hyaenas,(Crocuta crocuta), Anim. Behav.42:637–649.