Budiman, Hamdani, 		Azhar, Al, AND 		Yusuf, Irwandi.
" Analisis Kadar Timbal dan Gambaran Darah Gajah Sumatera (Elephas maximus sumatranus) di Pusat Latihan Gajah Sebanga Riau" <em>Jurnal Veteriner</em> [Online], Volume 11 Number 2 (1 June 2010)