Agil, M.; Candra, D.; Heistermann, M.; Hodges, J.J., 2008. Non-invasive monitoring reproductive status in the Sumatran Rhinoceros: EIA Pregnanolone (5-P-30H) or faecal hormone analysis in the female Sumatran rhino. Proceedings of AZWMC 2008: 79
Heistermann, M.; Agil, M.; Buethe, A.; Hodges, J.J., 1998. Metabolism and excretion of oestradiol-17B and progesterone in the Sumatran rhinoceros (Dicerorhinus sumatrensis). Animal Reproduction Science 53: 157-172, figs. 1-4, tables 1-2