References
- 1994 . Manawatu Evening Standard , 26 January
- Lukert , PD and Saif , YM . 1991 . “ Infectious bursal disease ” . In Diseases of Poultry , 9th Edition Edited by: Calnek , BW , Barnes , HJ , Beard , CW , Reid , WM and Yoder , HW . 648 – 663 . Ames : Iowa State University Press, .